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. 2012 Jul 16;7(3):418–425. doi: 10.1111/j.1750-2659.2012.00407.x

Table 4.

Crude and adjusted OR for variables associated with influenza‐like illness among household contacts of index patients

Variable Category Crude OR (95% CI) Adjusted OR (95% CI) Adjusted P
Age of household contact Risk per year 0·98 (0·95–1·0) 0·97 (0·94–1·0) 0·04
Close contact* with index patient 0–1 hours Ref Ref NA
2–4 hours 1·3 (0·5–3·9) 1·6 (0·5–5·3) 0·42
5–8 hours 0·8 (0·2–3·3) 0·8 (0·2–3·7) 0·76
≥9 hours 4·5 (1·4–14·5) 5·5 (1·4–21·4) 0·02

CI, confidence interval; OR, odds ratio.

*Close contact: <2 m to index patient.