Table 4. ORs for determinants of livestock-associated MRSA in humans, adjusted for number of hours worked per week on the farm, the Netherlands, 2011–2013*.

Variable	No.†	OR‡ (95% CI)	p value§	−2 log RSPL¶
Age, per 10 y increase	632	1.14 (0.93–1.41)	0.2	3,204.1
MRSA prevalence in pigs, %, per 10% increase	632	1.08 (0.97–1.21)	0.16	3,190.9
MRSA-negative farm
Yes	114	0.06 (0.01–0.27)	<0.01	3,288.1
No	518	Ref
Touching dogs in past 6–12 mo
Yes	446	0.51 (0.27–0.96)	0.04	3,173.7
No	180	Ref
Touching pigs from other farms in past 6–12 mo
Yes	86	2.82 (1.35–5.91)	0.01	3,205.3
No	546	Ref
Sorting of sows in past 7 d
Yes	221	1.91 (0.97–3.77)	0.06	3,144.5
No	392	Ref
Sorting of suckling piglets in past 7 d
Yes	159	2.21 (1.16–4.22)	0.02	3,169.5
No	455	Ref
Sorting of weaned piglets in past 7 d
Yes	174	1.63 (0.83–3.20)	0.16	3,162.9
No	439	Ref
Feeding sows in past 7 d
Yes	220	2.03 (0.99–4.17)	0.05	3,126.0
No	390	Ref
Cleaning and disinfecting weaned piglets section in past 7 d
Yes	81	1.70 (0.76–3.80)	0.2	3,157.8
No	538	Ref

*Results from the random intercept generalized linear mixed models accounting for the repeated measurements design and adjusted for number of hours worked. MRSA, methicillin-associated Staphylococcus aureus; OR, odds ratio; Ref, reference category; RSPL, residual pseudo-likelihood. Bold type indicates p values <0.05.
†Number of observations in all sampling times together (158 persons, 4 sampling times). Some variables have missing observations.
‡For analysis in humans, a farm and a person random intercept were included in the mixed models, and number of hours worked on the farm and sampling time were used for adjustment of ORs.
§Only variables with p<0.2 in the mixed models are presented in the human analysis. 
¶RSPL from the generalized linear mixed models.