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Predictors of delayed care seeking for tuberculosis in southern India: an observational study

BMC Infectious Diseases volume 17, Article number: 567 (2017) Cite this article

Abstract

Background

Reducing delay to accessing care is necessary to reduce the Tuberculosis (TB) burden in high incidence countries such as India. This study aimed to identify factors associated with delays in seeking care for TB in Southern India.

Methods

We analyzed data from newly diagnosed, smear-positive, culture-confirmed, pulmonary TB patients in the Regional Prospective Observational Research for TB (RePORT) cohort in Puducherry and Tamil Nadu, India. Data were collected on demographic characteristics, symptom duration, and TB knowledge, among other factors. Delay was defined as cough ≥4 weeks before treatment initiation. Risky alcohol use was defined by the AUDIT-C score which incorporates information about regular alcohol use and binge drinking. TB knowledge was assessed by knowing transmission mode or potential curability.

Results

Of 501 TB patients, 369 (73.7%) subjects delayed seeking care. In multivariable analysis, risky alcohol use was significantly associated with delay (aOR 2.20, 95% CI: 1.31, 3.68). Delay was less likely in lower versus higher income groups (<3000 versus >10,000 rupees/month, aOR 0.31, 95% CI: 0.12, 0.78). TB knowledge was not significantly associated with delay.

Conclusions

Local TB programs should consider that risky alcohol users may delay seeking care for TB. Further studies will be needed to determine why patients with higher income delay in seeking care.

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Background

In 2015 there were 2.8 million incident tuberculosis (TB) cases in India, comprising 27% of the 10.4 million global estimated TB cases [1, 2]. Reducing TB incidence will require a multi-pronged approach including efforts to decrease time to accessing care. Untreated, TB patients spread infection and increase their own mortality risk [3,4,5,6,7,8,9].

Although there have been several studies in India of predictors of delay in seeking care, results have been mixed and are likely setting-specific in such a large heterogeneous country [5, 10,11,12,13,14,15,16]. Previous studies have found that longer delay is associated with factors including income, substance abuse, location of first seeking care, and distance to health care facility among others [5, 10,11,12,13,14,15,16]. However other studies found no association with income and alcohol use [10, 11, 13, 16].

One potential component of delay is the disconnect between different healthcare systems. Patients can obtain healthcare through public and private clinics or a mix of both. The Revised National TB Control Programme (RNTCP) offers free TB diagnosis and treatment to patients in public clinics [17]. However, a recent study found that more than a quarter of prevalent TB patients are never evaluated at RNTCP clinics [18] and review of drug sales show that this number is likely even higher [1]. Patients often follow a circuitous route to diagnosis including self-medication and consulting private practitioners which often results in delayed diagnosis and treatment initiation [5, 11, 14,15,16]. A study of standardized patients found that only 21% of the cases were properly managed by private healthcare providers [17, 19]. More work is needed to understand factors associated with delay in the private and public sectors which include the time it takes patients to enter the health system and how long until they are started on TB treatment.

Previous studies have shown that hazardous alcohol use is prevalent in India [20,21,22,23,24]. The World Health Organization (WHO) estimated that 25% of the country’s men have consumed alcohol in the past year [24]. Other studies in India have found risky alcohol use in 40% of all males who consume alcohol [20, 22] and 52% of all male TB patients who consume alcohol [23]. Furthermore, in 2014, the WHO reported that alcohol use in India has increased in the last five years [25]. Alcohol use has been shown to be associated with poor TB treatment outcomes [23, 26] however, the degree of association between delays in seeking care and alcohol use has not been consistently demonstrated, possibly due to varying definitions of high alcohol use and regional differences in alcohol consumption [11,12,13, 27, 28]. Furthermore, while knowledge about TB has been identified as a reason for delay in qualitative studies [29, 30], to our knowledge, only one study in India has examined this association quantitatively [12]. We aimed to identify predictors of delay to treatment initiation at RNTCP clinics for new TB patients in Puducherry and Tamil Nadu to help inform public health interventions.

Methods

Study population and recruitment

This study is part of an ongoing observational household contact study in Puducherry and the Villapuram and Cuddalore districts of Tamil Nadu in southern India; the Regional Prospective Observational Research for TB (RePORT) study [31]. All new smear-positive patients are recruited from the 132 selected RNTCP designated microscopy centers (DMCs) and primary healthcare centers (PHCs) that are closest to Puducherry and see a large number of TB cases, out of a total of 305 centers. In brief, inclusion criteria include: Age ≥ 6 years; new TB diagnosis (category 1) with no known history of TB or TB treatment; smear-positive, culture-confirmed pulmonary TB; culture-negative cases are retrospectively excluded. Exclusion criteria include: having taken ≥3 doses of TB medication; known multi-drug resistance (MDR) infection (TB strain resistant to at least isoniazid and rifampicin) or contact with MDR case; not planning to continue treatment.

Data collection and study definitions

Study staff administered a questionnaire addressing demographic and clinical characteristics including age, gender, marital status, religion, caste, education level, monthly household income, alcohol use, smoking status, and knowledge of TB (Additional file 1). Most interviews were conducted in the clinic, although some were conducted in the subject’s home. Paper questionnaires were scanned and transferred to Boston University with Verity TeleForm Information Capture System software V10.8 (Sunnyvale, CA, USA), and read into a Microsoft Access (Seattle, WA, USA) database. Any errors were reviewed and corrected by the study team in India. Risky alcohol use was determined by AUDIT-C, a validated screening tool designed to identify individuals with hazardous drinking behavior by frequency and volume of alcohol consumption and binge-drinking [32, 33]. For example, a subject could be considered a risky drinker if they reported drinking alcohol: 2–3 times per week and having ≥3 drinks on a typical day; or 2–4 times a month and having ≥6 drinks in one sitting at least monthly. Subjects were shown standardized illustrations of the amount of alcohol that constitutes one drink.

To address knowledge of TB, participants were asked whether TB is curable and how it is transmitted. Individuals were provided with a list of options (coughing, sharing utensils, sharing clothes, smoking, touch, food, sexual contact, and mosquito bites) and they could choose as many answers as they believed appropriate. Correct knowledge of transmission was defined as choosing coughing regardless of whether other answers were chosen.

Individuals were asked about presence and duration of TB symptoms. Delay to accessing care was defined as duration from symptom onset until study enrollment (i.e. had received at most 3 doses of treatment). Symptom onset was determined by cough duration dichotomized by the median; those with a cough ≥4 weeks were defined as delayed in accessing care. The 4 week cutoff was chosen because median cough duration and cough duration of one month have both been used in previous studies of delay in accessing care for TB [4, 5, 34].

Patients were also asked where they first sought care; answers were dichotomized into government and private facilities based on whether the patient had to pay for treatment. Government facilities included government hospitals, PHCs, and municipal corporation hospitals. Private facilities included private allopathic clinics, non-allopathic clinics, medicine shops, and any other site. Although medical colleges could fit into either category, after discussion with study staff, these were allocated into private facilities.

Data analysis

Data were analyzed using SAS 9.4. Continuous variables were dichotomized by their medians. Both univariate and multivariable analyses were performed using logistic regression with delay as the outcome variable. Variables with p-values ≤0.2 in the univariate regression, as well as age and sex, were included in the multivariable model. Location of first care was also included in the model to account for the fact that delay could differ for those who visited other providers before RNTCP. Backward selection was considered but all variables with p-values ≤0.2 were of interest so none were removed. For those variables associated with delay in the multivariable model, logistic regression was used to assess associations with other predictors. We also examined interactions between variables that were associated with delay in the multivariable model.

Results

Socio-demographic characteristics

Overall, 656 TB patients who met study inclusion criteria were reported by the PHCs and DMCs from May 1, 2014 through July 27, 2016; of these, 638 (97%) were able to be located and were contacted regarding study enrollment. Of the 638, 514 (81%) consented to participate, and 501 were included in this analysis (3 were missing information on cough and 10 were missing Mtb culture data or other key variables).The subjects included 366 (73.1%) from Puducherry and 135 (26.9%) from Cuddalore and Villupuram in Tamil Nadu (Table 1). The mean age was 43.8 years (range: 14–81); 385 (76.8%) were men and 204 (40.7%) were risky alcohol users. The majority (352; 75.4%) had monthly household incomes between 3000 and 10,000 rupees. Most subjects (469; 93.6%) knew that TB is curable and 382 (76.2%) knew that it is transmitted by coughing. Many subjects (304; 61%) first sought care somewhere other than RNTCP clinics, including private clinics (253; 50.8%), pharmacies (24; 4.8%), medical colleges (21, 4.2%) and non-allopathic clinics (2; 0.4%).

Table 1 Socio-demographic characteristics of included participants
Full size table

Delays in care and factors associated with delay

The mean cough duration was 3.59 weeks (standard deviation: 1.14) and median 4 weeks (range: 1–12); the majority of subjects (71.9%) reported a cough duration of exactly 4 weeks. Overall, 369 (73.7%) delayed seeking care (cough duration of ≥4 weeks).

The multivariable model included 480 individuals; 21 were excluded due to missing data for one or more of the covariates. Risky alcohol use was associated with delay (adjusted odds ratio [aOR] 2.20; 95% confidence interval [CI]: 1.31, 3.68), after controlling for other factors (Table 2). Household income was also independently associated with delay. Subjects from households earning <3000 rupees were less likely to delay than those earning >10,000 rupees/month (aOR 0.31, 95% CI: 0.12–0.78; Table 2). Neither knowledge of transmission nor cure was associated with delay in multivariable models. Location where individuals first sought care (public vs. private facility) was not significantly associated with delay (aOR 1.25; 95% CI: 0.80, 1.96). However, the location of first care was associated with household income (p = 0.002); 76.9% of subjects in the highest income group visited a private facility first compared to 47.8% in the lowest income group.

Table 2 Univariate and multivariable analysis of risk factors for delay in engagement in care
Full size table

The interaction term between income and risky alcohol use was not statistically significant (p = 0.064) but did indicate that the trend for people with higher income to be more likely to experience delay was stronger among people without risky alcohol use. Since some medical colleges charge for services and some do not, the analysis was also performed with medical colleges classified as public; this change had no effect on the conclusions.

Characteristics of risky alcohol users

Of the 204 risky drinkers, 203 (99.5%) were male (Table 3). Risky alcohol users were more likely to be older (OR 1.58; 95% CI: 1.10, 2.27), employed (OR 4.00; 95% CI: 2.07, 7.72), from low income households (<3000 versus >10,000 rupees/month, OR 5.87, 95% CI: 2.75, 12.51), and to visit a government facility first (OR 1.74; 95% CI: 1.21, 2.51). In addition, risky alcohol users were more likely to not know that TB was curable (OR 2.98; 95% CI: 1.41, 6.33) or that it was transmitted by cough (OR 2.90; 95% CI: 1.90, 4.43).

Table 3 Characteristics of risky alcohol users
Full size table

Discussion

This study of newly diagnosed pulmonary TB patients in Puducherry and Tamil Nadu, India found that risky alcohol users and those with higher income levels were more likely to delay seeking care at RNTCP clinics. Identifying and addressing these predictors may improve the time to treatment initiation and reduce transmission.

Previous studies of the association between alcohol use and engagement in care in India report mixed results. Studies of new pulmonary TB patients in Wardha District in western India (n = 53) and Tamil Nadu in the south (n = 531) found that alcoholism (categorized into “never”, “sometimes”, and “regular” consumption, and habitual alcohol consumption respectively) was associated with delay [11, 27]. Other studies in Mandi District in northern India (n = 234) and Tamil Nadu (n = 601) found no association; the former categorized alcohol use as daily use, and the latter study did not differentiate between casual and risky drinkers [12, 13]. Importantly, these studies used several less-standardized measures of alcohol use which could have masked the association with delay. The AUDIT-C used in our study is a validated measure of risky alcohol use, providing a standardized definition that has been applied in a variety of settings [32, 33]. Regional differences in alcohol use also may affect its role in delaying access to care [28, 35].

Because 40.7% of TB patients were risky alcohol users in this cohort, these results demonstrate a need to target risky drinkers in Puducherry and Tamil Nadu to encourage earlier TB diagnosis. We found risky alcohol use was associated with being male, married, having lower income (but being employed), and having less education – all characteristics that have been found to be associated with alcohol use in other studies [20, 28, 35]. Understanding the characteristics of risky alcohol users in this population may help public health providers design interventions to achieve this goal.

In our study, higher income was associated with delay in seeking care. This is in contrast to other studies in India that found that lower income individuals were more likely to delay [12, 15]. This difference could be due to income definitions and analysis techniques. We defined income as household income and use multivariable analysis, while one study used per-capita income and also did not control for any confounders [15] Furthermore, a study in northern India that found low income was associated with delay used a dichotomized household income variable while our study classified income into four levels [12].

The association between higher income and delay could also be related to the type of clinic where a patient first sought care. Previous studies have shown that patients visiting a government facility first are likely to have longer “patient delay” (onset of symptoms to first seeking health care) while visiting a private facility first is associated with longer “health system delay” (time from first seeking care until diagnosis or treatment initiation) [5, 11,12,13,14, 34]. Because our study assessed total delay (patient and health system delays combined), we may not have been able to detect an association between location of first care and delay. Higher income participants were more likely than lower income participants to visit a private facility first, which could have led to longer health system delay thus increasing their total delay. The association between higher income and delay remained, however, when controlling for location of first care (i.e., even when controlling for whether a patient first went to a private clinic, higher income individuals had longer delay).

There could be other facets of the relationship between health-seeking behavior, delay, and income that our questionnaires did not capture – such as the number of facilities visited – which could contribute to longer delays. Higher income could also be associated with delay if these individuals do not suspect that they have TB or, because they perceive that TB is a disease of poverty [36, 37]. Higher income individuals may also delay seeking care at public facilities because they fear the stigma associated with TB which has been reported to affect health-seeking behavior [38,39,40]. The relationship between higher income, care at private clinics, stigma, and delay should be investigated further to understand the connections between these factors and how best to encourage timely TB diagnoses.

Knowledge of TB transmission in India was found to be 55.5% in a country-wide survey and 65% in Puducherry [41, 42]. Our study did not find a significant association between delay and knowledge about TB, defined by curability or mode of transmission. This finding was surprising, as in previous studies patients cited poor knowledge as a reason for delayed care [11, 29, 30]. Furthermore, improved TB knowledge seems to play a role in engagement in care as following an educational intervention in Delhi, the number of individuals self-reporting with TB symptoms to a treatment center increased [43]. It is possible that we did not find an association between knowledge and delay because we only assessed knowledge of transmission and cure; some studies used numerous questions to create a knowledge score, allowing for finer categorization of knowledge levels [3, 12]. It also could be that in this area, delayed care is dominated by other factors, notably alcohol use or that patients’ knowledge of TB does not affect engagement in care because people seek care for symptoms not because they suspect they have a certain disease. We found that risky alcohol use was associated with poor TB knowledge suggesting that educational programs may be warranted for this group.

Our study had the following limitations. It is difficult to correctly ascertain household income due to inaccurate recall, which could introduce bias into the results about income. Similarly, the use of cough duration to quantify delay hinges upon a subject’s ability to recall symptom duration and there is no standard threshold that indicates delay, which could lead to ascertainment bias. However because there are no other well-defined measures of delay, cough duration with a cutoff at the median or at one month has been used by numerous other studies [4, 5, 34]. The median cough duration for our sample was four weeks therefore defining delay by the median fulfilled both of the common practices. We attempted to minimize inaccurate recall by interviewing subjects within one week of treatment initiation. Furthermore, although we asked participants where they first sought care, we were not able to ascertain the time spent getting evaluated at other clinics. Ultimately, we were still able to quantify the clinically relevant delay between symptom onset and treatment initiation, because the study excludes any individuals who previously received ≥3 doses of treatment (including at another clinic).

Our analysis demonstrated that public health measures to hasten engagement in care in Puducherry and Tamil Nadu should focus on risky drinkers. As of now, RNTCP training materials recognize the need to screen TB patients for alcohol use and encourage abstaining; we suggest targeting risky alcohol users, including those in alcohol treatment programs to enhance TB screening [44]. Additionally, higher income individuals delayed seeking care and studies are needed to determine the reasons for this delay, as it is not solely due to seeking care in private clinics. Social programs may need to target higher income groups with education and/or stigma-reduction campaigns to improve their engagement in care.

Conclusion

As TB prevalence continues to rise in India, it is increasingly important to reduce the time that TB patients are infectious. In order to achieve this goal, the factors that contribute to delay in accessing care need to be thoroughly understood so that populations at risk for delay can be targeted. As stated by the WHO, a key component in eradicating TB worldwide will be the integration of TB control programs with other public health programs, such as for alcoholics in Southern India [2].

Abbreviations

aOR:

Adjusted odds ratio

CI:

Confidence interval

DMCs:

Designated microscopy centers

MDR:

Multi-drug resistance

PHCs:

Primary healthcare centers

RePORT:

Regional prospective observational research for TB

RNTCP:

The revised national TB control programme

TB:

Tuberculosis

WHO:

World Health Organization

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Acknowledgements

Data in this manuscript were collected as part of the RePORT India Consortium. The authors would like to thank the index cases, their families, and the field staff who worked on this project. We also acknowledge the work of Rachel Kubiak, the former Boston Medical Center study coordinator, and the Data Coordinating Center interns.

Funding

This project has been funded by Award No. USB-31150-XX-13 of the US Civilian Research & Development Foundation (CRDF Global) and by the National Science Foundation under Cooperative Agreement No. OISE-9531011 with Federal funds from the Government of India’s (GOI) Department of Biotechnology (DBT), the Indian Council of Medical Research (ICMR), the United States National Institutes of Health (NIH), National Institute of Allergy and Infectious Diseases (NIAID), Office of AIDS Research (OAR), and distributed in part by CRDF Global. The contents of this publication are solely the responsibility of the authors and do not represent the official views of the DBT, the ICMR, the NIH, or CRDF Global. SEV and HEJ were supported by the NIH (NIH-GMS T32GM074905 and US NIH K01AI102944 awards respectively).

Availability of data and materials

The datasets used and/or analyzed during the current study available from the corresponding author on reasonable request.

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Author notes

  1. Helen E. Jenkins and Natasha S Hochberg contributed equally.

Authors and Affiliations

  1. Department of Biostatistics, Boston University, Crosstown Building, 801 Massachusetts Avenue, 3rd Floor, Boston, MA, 02118, USA

    Sarah E. Van Ness & Helen E. Jenkins

  2. Department of Preventive and Social Medicine, JIPMER, Puducherry, India

    Ankit Chandra, Sonali Sarkar, Gautam Roy, Subitha Lakshminarayanan & Swaroop Sahu

  3. Boston Medical Center, Boston, MA, USA

    Jane Pleskunas

  4. Department of Medicine, Section of Infectious Diseases, Boston University School of Medicine, Boston, MA, USA

    Jerrold J. Ellner & Natasha S. Hochberg

  5. Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA

    C. Robert Horsburgh Jr & Natasha S. Hochberg

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Contributions

SEV, SSarkar, HEJ and NSH designed the study. SEV and AC analyzed the data and prepared the Tables. AC, SSarkar, JP, GR, SL, CRH, JJE, NSH, and SSahu all helped to collect the data. SEV and AC wrote the first draft of the paper. SEV, AC, SSarkar, JJE, CRH, HEJ and NSH contributed substantially to interpretation of results. All authors revised it critically for important intellectual content and prepared the final version of the paper. All authors have approved this version for publication.

Corresponding author

Correspondence to Sarah E. Van Ness.

Ethics declarations

Ethics approval and consent to participate

This study protocol was reviewed and approved by the Boston Medical Center and Rutgers Institutional Review Boards and the Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER) Ethics Committee and Scientific Advisory Committee. All subjects provided informed consent according to the Indian Council of Medical Research Ethical Guidelines for Biomedical Research on Human Participants and U.S. Code of Federal Regulations applicable to clinical studies.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Additional information

Sarah E. Van Ness and Ankit Chandra have contributed equally.

Helen E. Jenkins and Natasha S. Hochberg have contributed equally.

Additional file

Additional file 1:

The questionnaire that was used for data collection in this study. (PDF 139 kb)

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Van Ness, S.E., Chandra, A., Sarkar, S. et al. Predictors of delayed care seeking for tuberculosis in southern India: an observational study. BMC Infect Dis 17, 567 (2017). https://doi.org/10.1186/s12879-017-2629-9

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  • DOI: https://doi.org/10.1186/s12879-017-2629-9

Keywords

BMC Infectious Diseases

ISSN: 1471-2334

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