Table 7.

Predictors of Staphylococcus aureus colonization by log-binomial regression analysis (n=6082)^a

Characteristics	Women					Men
	Crude model			Adjusted model		Crude model			Adjusted model
Number	RR	95% CI	RR	95% CI	Number	RR	95% CI	RR	95% CI
Age, 10-year increment	2683	0.88	0.85–0.92	0.87	0.84–0.91	3399	0.97	0.94–0.99	0.96	0.93–0.98
18–25	580	1		1		396	1		1
26–35	697	0.98	0.85–1.12	0.97	0.85–1.11	959	0.91	0.81–1.03	0.90	0.81–0.99
36–45	470	0.77	0.65–0.91	0.75	0.63–0.89	704	0.98	0.87–1.10	0.95	0.84–1.08
46–55	515	0.75	0.63–0.88	0.72	0.61–0.85	653	0.91	0.80–1.03	0.88	0.77–1.00
56-67	421	0.67	0.56–0.81	0.66	0.55–0.79	559	0.83	0.72–0.95	0.80	0.70–0.92
BMI (categorized), kg/m2 b
Normal weight (18.5≤BMI<25)	1464	1				1600	1
Underweight (BMI<18.5)	20	1.02	0.56–1.87	0.96	0.53–1.74	6	1.93	1.34–2.77	1.80	1.25–2.59
Overweight (25≤BMI<30)	775	0.95	0.84–1.08	1.00	0.88–1.13	1392	1.08	0.99–1.17	1.10	1.01–1.19
Obese (BMI≥30)	373	1.15	1.00–1.33	1.22	1.06–1.41	361	1.32	1.19–1.47	1.36	1.22–1.51
Current smokingc
Nonsmoker	2341	1		1		2956	1		1
Smoker	312	0.80	0.66–0.96	0.78	0.64–0.93	427	0.83	0.73–0.94	0.83	0.73–0.94

Notes: Results presented as risk ratios (RR) with 95% CI. ^aLog-binomial regression analysis of S. aureus colonization with age (10-year age-groups), body mass index (BMI) categorized cf. WHO definitions, and current smoking as predictors, stratified by sex. Crude model = univariate log-binomial regression without adjustment; adjusted model = based on the crude model with additional adjustment for age, BMI (continuous), and current smoking status. ^bn=91 missing; ^cn=46 missing values.

Abbreviation: BMI, body mass index.