General hospital staff worries, perceived sufficiency of information and associated psychological distress during the A/H1N1 influenza pandemic

Background Health care workers (HCWs) presented frequent concerns regarding their health and their families' health and high levels of psychological distress during previous disease outbreaks, such as the SARS outbreak, which was associated with social isolation and intentional absenteeism. We aimed to assess HCWs concerns and anxiety, perceived sufficiency of information, and intended behavior during the recent A/H1N1 influenza pandemic and their associations with psychological distress. Method Between September 1st and 30th, 2009, 469 health-care workers (HCWs) of a tertiary teaching hospital completed a 20-item questionnaire regarding concerns and worries about the new A/H1N1 influenza pandemic, along with Cassileth's Information Styles Questionnaire (part-I) and the GHQ-28. Results More than half of the present study's HCWs (56.7%) reported they were worried about the A/H1N1 influenza pandemic, their degree of anxiety being moderately high (median 6/9). The most frequent concern was infection of family and friends and the health consequences of the disease (54.9%). The perceived risk of being infected was considered moderately high (median 6/9). Few HCWs (6.6%) had restricted their social contacts and fewer (3.8%) felt isolated by their family members and friends because of their hospital work, while a low percentage (4.3%) indented to take a leave to avoid infection. However, worry and degree of worry were significantly associated with intended absenteeism (p < 0.0005), restriction of social contacts (p < 0.0005), and psychological distress (p = 0.036). Perceived sufficiency of information about several aspects of the A/H1N1 influenza was moderately high, and the overall information about the A/H1N1 influenza was considered clear (median 7.4/9). Also, perceived sufficiency of information for the prognosis of the infection was significantly independently associated with the degree of worry about the pandemic (p = 0.008). Conclusions A significant proportion of HCWs experienced moderately high anxiety about the pandemic, and their degree of worry was an independent correlate of psychological distress. Since perceived sufficiency of information about the A/H1N1 influenza prognosis was associated with reduced degree of worry, hospital managers and consultation-liaison psychiatry services should try to provide for HCWs' need for information, in order to offer favourable working conditions in times of extreme distress, such as the current and future pandemics.


Background
In April 2009, a new influenza A/H1N1 virus infection (known also as swine flu) emerged in Mexico and soon spread around the world. In June 2009, the World Health Organization (WHO) declared a phase 6 pandemic (the first pandemic in the 21 st century and the first in 41 years), when sustained community spread of swine flu occurred in multiple WHO regions [1]. By August 2009, there had been over 209,438 cases of influenza A/H1N1 worldwide, and at least 2,185 deaths had been reported to WHO [2]. In Greece, after a moderate wave during July and August 2009, in which 1,839 cases of A/H1N1 influenza had been confirmed and 1 death had been reported [3], a new wave started in the middle of September, which peaked in the middle of November, with the number of confirmed cases in Greece increasing to 13.899, with 59 deaths by the end of the December, 2009 [4].
Although A/H1N1 influenza pandemic, as opposed to nosocomial infections like the Severe Acute Respiratory Syndrome (SARS), is a community spread infection for which the risk of contagion is fairly evenly distributed across the population, public health efforts to contain the spread of the A/H1N1 influenza resulted in infection control measures that dominated hospital procedures and policies. Thus, health care workers (HCWs) assumed a key role, encountering an increasing workload and a perception of increased risk of infection, as in any infectious disease outbreak, and this could possibly affect their psychological well-being.
Research on the impact that previous disease outbreaks had on the psychological well-being of HCWs has shown that many HCWs presented high levels of psychological distress, frequent concerns regarding their health and their families' health, worries about their functional ability and fears of stigmatization [5][6][7][8][9][10]. HCWs worries and psychological distress over the previous SARS outbreak have been associated with higher job stress, social isolation and health fears [5,6]. Also, among the factors that have been found to be associated with HCWs' psychological distress in previous infectious disease outbreaks were physical and emotional exhaustion because of an overburdened healthcare system [11], rapidly changing medical information and procedures [5,12], media scrutiny [5,12], being a nurse [13], perception of risk to themselves [6], lifestyle affected by the disease outbreak [13], and personal vulnerability [8,9]. Ithas been also reported that when facing a possibility of an influenza pandemic, a remarkable proportion of HCWs did not go to work, despite a strong sense of duty [14][15][16][17].
Identifying factors in the health care environment that may be associated with HCW worries and psychological distress regarding infectious disease outbreaks and understanding their role in motivating HCWs to engage or to avoid their duties may help to provide HCWs with the most favourable working conditions possible in times of extreme distress [6]. No studies, however, have investigated HCWs' worries, concerns or psychological distress at the height of the epidemic of the new strain of influenza virus, A/H1N1. Prompted by this fact, the aim of the present study was to assess HCWs' acute responses to A/H1N1 influenza pandemic as indicated by their degree of concerns and worries over the pandemic, their degree of perceived sufficiency of information concerning A/H1N1 influenza, their intended behavior during the pandemic and whether these factors were associated with psychological distress.

Methods
The study was carried out between September 1 st and 30 th , 2009, at the University General Hospital of Ioannina, Greece, a tertiary teaching hospital with 850 beds providing secondary and tertiary care for a general population of 350,000. After the first moderate wave of the A/H1N1 influenza pandemic in July and August, 2009, there was in the beginning of September an increasing public concern and fears about a new pandemic outbreak in autumn. Indeed, during the study, 8.8% of the referred patients were confirmed A/H1N1 influenza cases, a proportion which increased rapidly, reaching a peak in the middle of November with 65.8% confirmed A/H1N1 influenza cases, which decreased to 46.7% by the end of December, 2009. Overall, from September, 2009, to the end of December, 2009, 838 confirmed A/H1N1 influenza cases were referred to our hospital, without any reported deaths.
To assess HCWs' concerns and worries over the pandemic, their degree of perceived sufficiency of information concerning A/H1N1 influenza, their intended behavior during the pandemic and whether these factors were associated with psychological distress, the following self-reported questionnaires were administered, along with a request for demographic characteristics: (1) A questionnaire developed for this study comprising 20 items, which were chosen based on the available literature on the perceptions and opinions of experts regarding infectious disease outbreaks [Additional files 1 &2]. Eight items were dichotomous (Y/N) and 12 items were scored on a 9-point Likert scale from very little (1) to very much (9), very low (1) to very high (9) or strongly agree (9) to strongly disagree (1) ( Tables 1, 2 & 3). Items were grouped in seven domains: (a) HCWs' concerns, worries and degree of worry about the A/H1N1 influenza pandemic, (b) perceived sufficiency of information, (c) confidence in information received and measures taken by their department regarding A/H1N1 influenza pandemic, (d) perception of personal risk, (e) perception of being a risk to others (e.g. family and friends), (f) perception of stigmatization, isolation and sense of duty, and (g) work satisfaction. Cronbach's α score for factors consisting of items related to perceived information and information needs ranged from 0.68 to 0.89. Part-I of Cassileth's Information Styles Questionnaire [18] was also embedded in the questionnaire, which assesses the amount of desirable informational details about health issues required by the hospital worker, on a 5-point Likert scale.
(2) To assess HCWs psychological distress, the General Health Questionnaire-28 (GHQ-28) [19] was used. It comprises 28 items and, according to its standardization for the Greek population [20], scores above 5 are indicative of mild to moderate psychological distress. Studies have also shown that scores above 11 are indicative of severe psychological distress [21]. As the total GHQ-28 score exceeds this recommended cut-off point, the probability of being assessed as having a psychiatric diagnosis at interview increases.

Recruitment
HCWs in all the hospital's departments and clinical units, including the intensive care unit and the emergency department, were asked to participate in the study. A letter was sent to each department director, informing them about the study and asking for their permission to distribute the questionnaires to employees in their departments. All contacted departments agreed to participate. In a scheduled meeting with each department's staff, an estimated number of 1000 potential participants were informed about the aims of the study and that participation was voluntary. Blank questionnaires with sealed boxes for collection of responses were placed at various designated work areas in each participating unit. Four hundred sixty-nine subjects (response rate: 46.9%) returned the survey after an informed consent was obtained. The participants were divided into four groups: Medical staff, nursing staff, allied personnel (physiotherapists, social workers, psychologists, etc) and auxiliary staff (domestic services, administration, etc). All the procedures

Statistical analysis
All the statistical analyses were performed using the Statistical Package for the Social Sciences (SPSS) 15.0 (SPSS Inc., Chicago, IL, USA) for Windows. Summary statistics for all variables were calculated. Normality was tested by  the Kolmogorov-Smirnov test [22]. Chi-square analyses and one-way Analyses of Variance (ANOVA) were performed to assess differences in concerns, worries, degree of worry and perceived sufficiency of information among the groups of the hospital staff. To assess the relationship of worries and degree of worry with intended behaviour, chi-square analyses for categorical data (e.g. worries [Y/N], or intended behaviour [Y/N]) and two-tailed t-tests for continuous data (e.g. degree of worry) were carried out [22]. Univariate comparisons were conducted next to assess variables associated with the degree of worry about the A/H1N1 influenza pandemic and the HCWs' psychological distress. Chisquare analyses for categorical data (e.g. for testing the relationship of "psychiatric caseness" [GHQ < 5/GHQ > 5] with gender [M/F]), two-tailed t-tests for continuous data (e.g. for testing the relationship of degree of worry with gender [M/F]) and Pearson correlations for testing the relationship between continuous variables (e.g. between degree of worry and age) were carried out [22]. To assess the factors most closely associated with HCWs' degree of worry, a multiple regression analysis was carried out with dependent variable the degree of worry and independent variables the major demographic variables and the statistically significant variables of the previous univariate analyses. Missing data of independent variables were treated by mean substitution. Colinearity between independent variables was tested based on variance inflation factors (VIF) and tolerances for individual variables [23]. Finally, a binary logistic regression analysis was used to identify the multivariate associations of HCW's psychological distress adjusting for demographic variables. The dichotomous dependent variable was "total GHQ score" and the cut-off point was "5", as found by receiver-operating characteristics analysis for the GHQ-28 in the Greek population [20]. Selection of independent variables was based on the results of the previous univariate analyses. and medical staff (6.7%) who presented "severe psychological distress" was also higher, in comparison to allied (1.7%) and auxiliary (3.7%) personnel (p = 0.033).

Concerns and worries about the A/H1N1 influenza pandemic
As shown in Table 1, 56.7% of the participants reported they were worried about the A/H1N1 influenza pandemic, their scores of their degree of worry being indicative of moderately high concern (median, 6/9). The proportion of nurses, auxiliary staff, and allied personnel that reported that they were worried was higher compared to that of the medical staff (p < 0.0005). Auxiliary staff presented higher degree of worry than all other groups, and nurses were also more worried than medical staff (p < 0.0005). The most frequent concern was the risk of infection of family and friends, followed by worries about the dangerousness of the disease and its consequences on their functional ability. Significantly more nurses and auxiliary staff worried about the danger of the disease (p < 0.0005). Concerns about isolation from family and/or social environment were low across all groups (9.3% to 14.2%). The perceived risk of being infected by the A/H1N1 virus was considered moderately high (median, 6/9), with no significant differences among groups. Over 50% of the participants agreed to some extent that being infected with the A/H1N1 influenza would have a major consequence on their health (median, 5/9), with medical staff presenting the lower rates and auxiliary staff presenting the higher rates (p < 0.0005). More than half also agreed to some degree that the infection is difficult to treat (median, 5/9), with medical staff again presenting the lower rates. More than half the HCWs agreed to some degree that the ward/department where they worked was well prepared for the A/H1N1 influenza pandemic (median, 5/9), with nurses presenting the lower rates of agreement in this statement, compared to the opinion of the other professionals. Finally, the existence of a service offering psychological support regarding the HWCs' concerns about the A/H1N1 influenza was considered of moderately high importance (median, 6/9), and medical staff were less likely to perceive this need.
Perceived sufficiency of information about the H1N1 influenza pandemic As shown in Table 2, the degree of HCWs' perceived sufficiency of information about the A/H1N1 influenza symptoms, prognosis, treatment, contagion route, and preventive measures could be considered moderately high to high (medians ranged from 7/9 to 8/9). A significant proportion of HCWs agreed to some degree that the information provided by the workers' department was clear (median, 6/9), while the overall information about the A/ H1N1 influenza was considered clear, as well (median, 7.4/9). Medical staff reported the highest rates of perceived sufficiency of information, compared to the other groups.
Regarding general health information needs, a significant proportion of the staff (43.7%) reported that for a disease that they might suffer, they preferred as much information as possible. An additional 36.3% wanted "a few more", "some more" or "many more" informational details, while one fifth (20.0%) wanted only to know the information needed to care for themselves properly and wished to avoid additional details. The overall mean and median for general information needs are presented in Table 2. There were minimal differences among the staff categories, with nurses preferring more frequently as much information as possible (50.0%, compared to 41.5% of the medical staff and to 37.3% of the allied and auxiliary personnel).

Worry and intended behavior
As shown in Table 3, few HCWs (N = 31, 6.6%) reported that they had restricted their social contacts because they considered their work environment "dangerous" and 18 (3.8%) felt that family members and friends avoided them because of their hospital work. Along the same lines, few HCWs (N = 20, 4.3%) reported that they would take a leave to avoid infection. However, worries and degree of worry were significantly associated with intended behaviors, mainly with restriction in social contacts and intentional absenteeism.

Factors associated with the degree of worry about the A/H1N1 influenza pandemic
Univariate analyses revealed a number of variables associated with the degree of worry about the A/H1N1 influenza pandemic (Table 5). Subsequent multiple regression analysis showed that perceived information about the A/H1N1 influenza prognosis was the variable most closely negatively associated with the degree of worry (p = 0.008). On the other hand, being auxiliary staff (p = 0.023), believing that being infected with the A/H1N1 influenza would have major health consequences (p < 0.0005) and that the infection would be difficult to treat (p = 0.003) were the variables most closely positively associated with the degree of worry.

Factors associated with hospital staff's psychological distress
As shown in Table 6, univariate analyses revealed a number of variables associated with general psychological distress. Subsequent multiple logistic regression analysis showed that the degree of worry about the A/ H1N1 influenza pandemic was significantly independently associated with psychological distress (p = 0.036). Additionally, the odds of being assessed with moderate or severe psychological distress upon interview were 2.2 times greater among nurses and 4.5 times greater among auxiliary staff, compared to medical and allied staff, while work satisfaction was independently negatively associated with psychological distress.

Discussion
The results of the present study showed that in September, 2009, when there were significant public and hospital staff concerns about a new A/H1N1 influenza pandemic outbreak, more than half of our hospital's HCWs (56.7%) reported they worried about the pandemic, their degree of worry being moderately high. The most frequent concern was for infection of family and friends and the consequences of the disease on their health. The perceived risk for being infected was considered moderately high and more than half agreed to some degree that being infected with the A/H1N1 influenza would have a major consequence on their health. Few HCWs (6.6%) had restricted their social contacts and fewer (3.8%) felt isolated by their family members and friends because of their hospital work, while a low percentage (4.3%) would take a leave to avoid infection. However, worries and degree of worry were significantly associated with intentional absenteeism, restriction of social contacts, and psychological distress. Perceived sufficiency of information about several aspects of the A/H1N1 influenza was moderately high, and the overall information about the A/H1N1 influenza was considered clear. Although more than half agreed to some degree that the ward/department they worked was well prepared for the pandemic, a significant proportion (44.4%) expressed a disagreement (at least somewhat) in this respect, with nurses presenting the lower rates of agreement. Finally, perceived sufficiency of information for the prognosis of the infection was the variable most closely independently associated with the degree of worry about the pandemic.
It has been well established that HCWs experienced significant stress during infectious epidemics [5][6][7][8][9]. Reports of the psychological impact of SARS on hospital staff indicated that high levels of distress were common [5]. In Singapore, over 27% of HCWs had a GHQ-28 score >5 and approximately 20% of the doctors and nurses were suffering from PTSD [24]. In one Toronto hospital, 29% of respondents scored above the threshold for "emotional distress" on GHQ-12 [17], while in Taiwan, 5% of staff members suffered from an acute stress disorder [7]. Studies on HCWs' concerns about the avian influenza pandemic have also shown that 71.6% had significant concerns and had perceived the pandemic as having adverse impacts on their personal life and work [10]. Despite, however, the large epidemiological literature on the A/H1N1 influenza pandemic, there is little information available regarding the worries, concerns or the psychological impact that the pandemic might have on HCWs. To the best of our knowledge, at the time of reporting, this is the first study investigating the acute concerns and worries of hospital staff about the A/H1N1 influenza pandemic and their associations with psychological distress.
Our results showed that more than half of HCWs experienced moderately high levels of worry about the pandemic, with auxiliary staff being more worried than all other groups and nurses being more worried than medical staff. On the other hand, our findings also showed that 20.7% of HCWs presented scores indicating mild to moderate psychological distress, rates similar to those found in a previous study, at times when there was no infectious exposure, when 18.1% of HCWs presented scores indicating mild to moderate psychological distress [25]. In another study of 275 HCWs in the same hospital one year before the infectious outbreak, we found that 21.8% presented scores indicative of mild or moderate psychological distress (unpublished data). These findings indicate that psychological distress is a common experience in HCWs, as also has been suggested by studies in the UK, which have shown that among doctors and nurses, between 28 and 32% scored above the threshold for "emotional distress" in GHQ-12 [26][27][28]. However, despite the fact that HCWs' psychological distress was not elevated in the present study, their Table 5 Variables associated with the hospital staffs degree of worry about A/H1N1 influenza pandemic (N = 469)

Independent Variables
Univariate Analyses Multiple Regression Analysis (1) p-values beta (2) p-values  degree of worry about the pandemic was an independent correlate of psychological distress (Table 6), indicating that HCWs concerns about the pandemic might contribute to psychological distress. The cross-sectional design of our study prevent us from answering questions about causality, since it is plausible, for instance, that people who are already distressed for reasons not measured in this study are more likely to worry about A/ H1N1 influenza pandemic. Work satisfaction was also associated with psychological distress (Table 6) but it was not correlated to the degree of worry about the pandemic ( Table 5), indicating that the association of work dissatisfaction with psychological distress could be attributed to the chronic stress and burnout that are common in hospital settings and leading contributors to work dissatisfaction [29] rather than the HCW's concerns about the pandemic. Consistent with the results of previous studies in SARS-affected hospitals [17,30,31], nurses and medical staff presented high rates of psychological distress. Although by definition, both medical staff and nurses have greater contact with patients, medical staff expressed the lower degree of worry (Table 1), possibly because they mostly regarded themselves as sufficiently informed (Table 2). A greater proportion of nurses and auxiliary staff also worried about the A/H1N1 influenza pandemic compared to medical staff, and their degree of worry was also greater than that of doctors (Table 1). Auxiliary staff expressed the highest level of worry, while being a nurse and/or auxiliary staff was significantly associated with psychological distress. In addition, auxiliary staff considered the consequences of the infection for their health to be greater (Table 1). These findings indicate that assessing and intervening for the psychological impact of the infectious outbreak on HCWs, especially on nurses and auxiliary staff, is of particular importance in planning for the current and future outbreaks of infectious diseases. Hospital policies Table 6 Variables associated with the hospital staff's general psychological distress (N = 469).

Independent Variables
Univariate Analyses Multivariate Logistic Regression Analysis (1) p-values Odds ratios (95% CI) (2) p-values should also take into account auxiliary staff's concerns and worries, and since we found that perceived sufficiency of information was associated with lower degree of worry, hospital managers should try to provide for auxiliary staff's information needs, in order to provide a favourable working environment in times of extreme public health-related concerns, such as the current A/ H1N1 influenza pandemic. Nurses constitute the largest hospital occupational group and are directly and intensively involved in patient care, experiencing a greater risk of contagion in cases of infectious diseases. It is therefore not surprising that nurses reported the higher percentages when asked whether, for a disease that they might contract, they would prefer as much information as possible, while they also felt their department was less well prepared for the A/H1N1 influenza pandemic, compared to the other staff groups (Table 1). Other studies have also found that in a pandemic of influenza, medical and nursing staff were significantly less likely than ancillary and support staff to consider their ward/department sufficiently prepared for the pandemic [32]. Our results and the results of the aforementioned studies indicate that hospital and department managers and directors should consider the opinions of nurses and medical staff with respect to the proper ward/department preparation for a pandemic, if they are to offer the most favourable working conditions possible for HCWs in times of extreme distress, such as the current and future infection pandemics.

Demographics
Consistent with the results of other studies reporting that distress can be amplified in the face of lack of clear information that is common in the initial period of disease outbreaks [33], in our study perceived sufficiency of information about the A/H1N1 influenza prognosis was independently associated with reduced degree of worry (Table 5).
HCWs across a range of professions tended to feel motivated to work during the A/H1N1 influenza pandemic, as indicated by the high sense of duty expressed and by the low proportion of HCWs reporting that they would take a leave to avoid infection (4.3%). In addition, although fear of stigmatization, in the form of being avoided by family and friends, was observed to be a prominent aspect of many HCWs' experience during SARS [5,7,16,17], this was not the case in the present study, where only 3.8% felt that family and friends avoided them because of their hospital work, and only 6.6% had restricted their social contacts themselves. This is not surprising, since the stigmatization reactions of the public to SARS was founded on the fact that the infection was limited to hospitals, whereas the A/H1N1 infection is a community spread infection for which the risk of infection is fairly evenly distributed across the population. Nevertheless, studies in other countries have shown variable rates of intentional absenteeism due to contagious diseases [12][13][14]32], depending on the kind of the infection, the different time periods the studies took place, the different survey questions, and the cultural differences or religious beliefs. Our results indicated that most HCWs surveyed considered that it was not possible to avoid their duties in an emergency situation due to the pandemic and they would continue working despite the potential risks (Table 3), a finding consistent with the view that HCWs consider it unethical to abandon their professional responsibilities in order to protect themselves or their families [32,34,35].
The main methodological limitation of the present study lies in the response rate. An accurate estimation of the response rate was difficult, because the number of staff who could have been contacted during the 4week period the study took place is difficult to estimate, given that in September many Greek employees are on vacation. However, the response rate of this study (46.9%) is comparable to other studies investigating HCWs' concerns and distress about infectious outbreaks (for example, 47% in the study of Nickell et al [17], 41.1% in the study of Styra et al [6], or 23.3% in the study of Maunder et al [5]). In addition, comparison of the characteristics of the study sample with the total hospital employees suggested that the study sample is representative of HCWs in our hospital. For example, nurses comprise 46.4% of the hospital staff and 44.6% of the study sample. Despite this, however, we cannot refute the criticism that an underlying response style might have led to our results. We also cannot exclude the possibility that particularly concerned or distressed HCWs were under-represented, as such subjects might be on leave because of their worries about the pandemic and thus unable to join the study. Further methodological limitations are the potential for bias caused by socially acceptable answering resulting in possible underestimated intentional absenteeism rates. Gathering information regarding psychological distress by selfreport is a further limitation. Finally, as mentioned earlier, questions about causality cannot be resolved by cross-sectional surveys, and therefore future prospective studies are needed to confirm our findings and to investigate the causal paths of the associations reported regarding HCWs concerns and worries about A/H1N1 influenza pandemic, psychological distress, perceived information and intended behaviour.

Conclusions
In conclusion, our study showed that a significant proportion of HCWs experienced moderately high levels of worry about the pandemic, and their degree of worry was an independent correlate of psychological distress. Few HCWs had restricted their social contacts, while a low percentage would take a leave to avoid infection.
However, worries and degree of worry were significantly associated with intentional absenteeism and restriction of social contacts. Since perceived sufficiency of information about the A/H1N1 influenza was associated with reduced degree of worry, hospital policies should try to provide for HCWs' information needs, in order to provide the best possible working conditions in times of extreme public and hospital staff distress, such as the current A/H1N1 influenza pandemic.

Study highlights
1) What is current knowledge: • Health care workers (HCWs) presented frequent concerns regarding their health and their families' health, high levels of psychological distress, worries about their functional ability and fears of stigmatization during previous disease outbreaks.
• HCWs' worries and psychological distress over the previous SARS outbreak have also been associated with higher job stress, social isolation and intentional absenteeism.
• No studies have investigated HCWs' worries, concerns or psychological distress during the peak of the new strain of influenza virus, A/H1N1 and it is not known whether the previous SARS experience is representative or unique.
2) What is new here: • In September, 2009, during the A/H1N1 pandemic, more than half of HCWs experienced moderately high levels of worry about the pandemic, with auxiliary staff presenting the higher degree of worry and nurses being more worried than medical staff.
• The most frequent concern was for infection of family and friends and the consequences of the disease on their health. • The degree of worry about the pandemic was an independent correlate of psychological distress.
• Few HCWs (6.6%) had restricted their social contacts and fewer (3.8%) felt isolated by their family members and friends because of their hospital work, while a low percentage (4.3%) would take a leave to avoid infection. However, worries and degree of worry were significantly associated with intentional absenteeism and restriction of social contacts.
• Most HCWs considered that it was not possible to avoid their duties in an emergency situation due to the pandemic and they would continue working despite the potential risks.
• Perceived sufficiency of information about several aspects of the A/H1N1 influenza was moderately high, while perceived sufficiency of information about the A/H1N1 influenza prognosis was independently associated with reduced degree of worry.
• Hospital managers and consultation-liaison psychiatry services should try to provide for HCWs' information needs, if we are to offer favourable working conditions in times of extreme distress, such as the current and future pandemics.

Additional material
Additional file 1: Questionnaire for assessing hospital staff worries and perceived sufficiency of information during the A/H1N1 influenza pandemic (Greek version). This file contains the Greek battery administered to assess hospital staff worries, perceived sufficiency of information and associated psychological distress during the A/H1N1 influenza pandemic.
Additional file 2: Questionnaire for assessing hospital staff worries and perceived sufficiency of information during the A/H1N1 influenza pandemic (English version). This file contains the English translation of the questionnaire administered to assess hospital staff worries and perceived sufficiency of information during the A/H1N1 influenza pandemic.