Table 5. Multivariate analysis taking account of work-related and non-work-related personal factors pert ULNMD location.

		ULNMD location
		Neck	Shoulder	Elbow	Wrist
		PR [95% CI]	PR [95% CI]	PR [95% CI]	PR [95% CI]
Age	<30 yr		1.0****	1.0****	1.0*
	30–39 yr		1.28 [1.04–1.57]	0.77 [0.41–1.45]	0.86 [0.70–1.05]
	40–49 yr		1.47 [1.22–1.77]	1.78 [1.04–3.08]	0.69 [0.56–0.85]
	≥50 yr		1.75 [1.45–2.10]	2.02 [1.13–3.61]	0.89 [0.66–1.25]
Children	No children			1.0***
	No dependent children			2.03 [1.7–3.50]
	≥1 dependent child			1.76 [1.09–2.84]
Smoking	Non-smoker	1.0**
	Ex-smoker	1.26 [1.09–1.47]
	Smoker	1.21 [1.09–1.34]
Schedule	Fixed-schedule daytime work	1.0*
	Other	1.15 [1.02–1.29]
Experience of work with elderly persons	1–4 yr	1.0**
	5–9 yr	0.93 [0.80–1.06]
	10–19 yr	1.14 [1.00–1.28]
	>20 yr	1.09 [0.94–1.26]
Occupational group	Housekeepers		1.0*		1.0****
	Nursing Assistants		1.17 [1.02–1.34]		1.03 [0.85–1.25]
	Nurses		0.99 [0.82–1.20]		0.57 [0.41–0.80]
Night-shifts	No		1.0*
	Yes		0.78 [0.65–0.94]
Seniority in the establishment (years of experience)	≤1 yr			1.29 [0.82–2.04]
	2–4 yr			1.0****
	5–10 yr			1.23 [0.80–1.91]
	>10 yr			1.80 [1.22–2.66]
Effort/reward imbalance	No	1.0***	1.0****	1.0***	1.0****
	Yes	1.30 [1.16–1.45]	1.30 [1.13–1.48]	1.69 [1.20–2.37]	1.49 [1.22–1.82]
Over-commitment	No	1.0	1.0****	1.0****	1.0****
	Yes	1.36 [1.22–1.52]	1.41 [1.26–1.59]	1.37 [1.05–1.78]	1.65 [1.39–1.96]

Prevalence Ratio (PR), Confidence Interval (CI). p significant: *p<0.05; ** p<0.01; *** p<0.001; **** p≤10⁻⁴