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Table 2 Probabilities of at least one secondary case in the household

From: Oseltamivir for treatment and prevention of pandemic influenza A/H1N1 virus infection in households, Milwaukee, 2009

  n Any secondary infections in household
   SAR (95% CI) Univariate OR (95% CI) Multivariate OR (95% CI)
Index oseltamivi usage from his/her onset        
   Within 1 day 29 0.17 (0.06, 0.36) 0.47 (0.16, 1.37) 0.58 (0.19, 1.75)
   1-2 days 11 0.27 (0.06, 0.61) 0.85 (0.21, 3.45) 1.15 (0.27, 4.99)
   3+ days/No usage 95 0.31 (0.21, 0.41) -   -  
Household with adult index 37 0.19 (0.08, 0.35) -   -  
Household with child index 98 0.31 (0.22, 0.41) 1.89 (0.75, 4.78) 1.30 (0.47, 3.57)
Household size (# of ppl)        
   ≤ 3 48 0.15 (0.06, 0.28) 1.00   -  
   4 41 0.34 (0.20, 0.51) 3.04 (1.09, 8.50) 2.81 (0.98, 8.10)
   ≥ 5 46 0.35 (0.21, 0.50) 3.12 (1.14, 8.54) 2.73 (0.94, 7.88)