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Table 4 Secondary attack rates at the individual level

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

  n Secondary infection in household contacts
   SAR (95% CI) Univariate OR (95% CI) Multivariate OR (95% CI)
Index oseltamivir usage from his/her onset        
   Within 1 day 29 0.09 (0.03, 0.17) 0.53 (0.20, 1.37) 0.57 (0.20, 1.62)
   1-2 days 11 0.17 (0.00,0.33) 1.06 (0.30, 3.69) 1.11 (0.30, 4.11)
   3+ days/No usage 95 0.14 (0.10, 0.19) -   -  
Household with adult index 37 0.10 (0.04, 0.17) 1.00   1.00  
Household with child index 98 0.14 (0.10, 0.19) 1.48 (0.62, 3.51) 1.55 (0.58, 4.15)
Adult contact* 217 0.09 (0.05, 0.13) -   -  
Child contact* 173 0.20 (0.13, 0.27) 2.71 (1.47, 5.02) 2.79 (1.50, 5.20)
Household size (# of ppl)        
   ≤ 3 48 0.11 (0.04, 0.20) -   -  
   4 41 0.14 (0.07, 0.20) 1.26 (0.48, 3.30) 0.93 (0.32, 2.72)
   ≥ 5 46 0.14 (0.08, 0.20) 1.25 (0.48, 3.24) 0.74 (0.26, 2.10)
  1. * Multivariable ORs adjusted for unknown age group for 21 contacts via multiple imputations with 10 imputations