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Table 1 Demographic characteristics, clinical symptoms, underlying conditions, influenza vaccination history, and exposure to persons with influenza-like illness (ILI) in 50 severe acute respiratory infection (sARI) cases and 79 ILI controls infected with pH1N1 influenza

From: Severe acute respiratory infection risk following glucocorticosteroid treatment in uncomplicated influenza-like illness resulting from pH1N1 influenza infection: a case control study

ItemsVariablesNumber exposedPercent exposedp-valuec
Case (N = 50)Control (N = 79)CaseControl
Demographic characteristicsSex    0.19
Age group    0.11
Symptoms before sARI aFever    0.37
 37.5 °C–37.9 °C10272034.2 
 38.0 °C–38.9 °C25345043.0 
 39.0 °C − 39.9 °C13162620.2 
 40.0 °C–40.9 °C2242.5 
Bloody sputum1020.00.39*
Pulmonary Infiltrate75146.30.16*
Underlying conditions bPregnant122.02.50.67*
Drinks alcohol112.01.30.63*
Underlying disease241948.0240.00
Number of underlying conditions    0.012
Vaccination historySeasonal influenza vaccination in past 5 years161732.021.50.18
Pandemic H1N1 vaccination224.02.50.50*
Exposure to ILI before ILI onsetAt home or work264252.053.20.90
At home141328.016.50.12
At work place162732.034.20.80
  1. Symptoms before sARI a: We applied the time interval from ILI onset to sARI onset of the case to the matched controls to impute sARI onset for control patients. Underlying conditions b: According to “The Ministry of Health H1N1 flu diagnosis and treatment plan,” Underlying conditions included Pregnant, Obesity, Smoker, Drinks alcohol and Underlying disease etc., Underlying disease included Pulmonary, Cardiovascular, Metabolic, Renal, Hepatic, Neoplastic, Neurological, and Immunosuppression etc. Immunosuppression meant that the patient was taking drugs to suppress immunity or that the patient had a disease that caused immunosuppression directly. p-valuec: Chi-Square test; *Fisher exact test