Table 3.

Final multivariate model of risk of S. aureus using generalized estimating equations to adjust for clustering^*

Parameter	OR (95% CI)	P value
Employed at a childcare facility	0·68 (0·31–1·50)	0·34
Season	3·10 (1·26–7·59)	0·013
Age (years)
< 25	Reference	—
25–34	0·55 (0·27–1·15)	0·11
35–44	0·40 (0·15–1·07)	0·068
⩾ 45	0·21 (0·077–0·56)	0·0020
Family member with recent influenza-like illness	0·52 (0·27–0·98)	0·045
Family member with contact with cattle	0·31 (0·081–1·16)	0·082

OR, Odds ratio; CI, confidence interval.

^*Model-based standard error estimates.