Table 5. Household risk factors for influenza-like illness in a subset of 2,615 children 2–11 years of age, Managua, Nicaragua, 2005–2007*.

Characteristic	Crude RR† (95% CI)	Adjusted RR†‡ (95% CI)
Sex
M	0.96 (0.87–1.07)	0.98 (0.89–1.07)
F	Ref	Ref
Age, y
2	5.01 (3.63–6.93)	4.83 (3.50–6.66)
3	4.21 (3.08–5.76)	4.07 (2.98–5.56)
4	3.13 (2.29–4.30)	3.05 (2.22–4.18)
5	2.55 (1.85–3.51)	2.51 (1.82–3.45)
6	2.03 (1.47–2.80)	2.01 (1.46–2.78)
7	2.01 (1.45–2.80)	2.00 (1.44–2.78)
8	1.50 (1.06–2.12)	1.49 (1.06–2.10)
9	1.55 (1.10–2.19)	1.54 (1.09–2.17)
10	1.25 (0.88–1.77)	1.24 (0.88–1.76)
11	Ref	Ref
Asthma
Yes	1.83 (1.57–2.13)	1.51 (1.32–1.75)
No	Ref	Ref
Persons/room
<3	Ref	Ref
3–4	1.04 (0.93–1.17)	1.07 (0.96–1.20)
>5	1.14 (1.00–1.31)	1.18 (1.04–1.34)
Mother literate
Yes	0.80 (0.63–1.01)	0.79 (0.64–0.98)
No	Ref	Ref
Dirt floor
Yes	0.95 (0.84–1.08)	0.88 (0.78–1.00)
No	Ref	Ref

*RR, relative risk; CI, confidence interval; Ref, reference.
†The measure of RR used is the incidence rate ratio.
‡Multivariate model included sex, age, asthma status, person density in house, mother’s literacy, and a dirt floor.