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Table 1 Demographics of study population

From: Seroconversion and asymptomatic infections during oseltamivir prophylaxis against Influenza A H1N1 2009

  Overall (n = 237) Outbreak A (n = 149) Outbreak B (n = 42) Outbreak C (n = 46)
Mean age (SE) (range) 21.2 (1.7)
(18.7-30.8)
21.1 (2.1) (18.7-30.8) 21.2 (0.8) (20.2-23.8) 21.2 (0.5) (20.1-22.4)
Median age (yr)     
Male 237 (100%) 149 (100%) 42 (100%) 46 (100%)
Ethnicity     
   Chinese 175 (73.8%) 100 (67.1%) 36 (85.7%) 39 (84.8%)
   Malay 41 (17.3%) 34 (22.8%) 4 (9.5%) 3 (6.5%)
   Indian 12 (5.1%) 8 (5.4%) 1 (2.4%) 3 (6.5%)
   Others 9 (3.8%) 7 (4.7%) 1 (2.4%) 1 (2.2%)
Significant medical history 25 (10.5%)* 21 (14.1%) 4 (9.5%) 0 (0.0%)
  1. *All cases of significant medical history were asthma except 1 case of hypertension and 1 case of IgA nephropathy