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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