Table 4.

Prevalence of neck pain by ergonomic or work variables.

Variables	Neck pain
	Prevalence
	Total	N	%	PR 95% CI
Repetitive movements
Never/Rarely	240	39	16.2	1.00
Always/Usually	360	83	23.1	1.42 (1.01–2.00)
Vibration/Shake
Never/Rarely	505	98	19.4	1.00
Always/Usually	95	24	25.3	1.30 (0.88–1.92)
Carrying and transporting loads
Never/Rarely	400	72	18.0	1.00
Always/Usually	200	50	25.0	1.39 (1.01–1.91)
Sitting position
Never/Rarely	223	43	19.3	1.00
Always/Usually	377	79	21.0	1.09 (0.78–1.52)
Sitting and lifting loads
Never/Rarely	551	110	19.9	1.00
Always/Usually	49	12	24.5	1.23 (0.73–2.06)
Sitting and leaning
Never/Rarely	444	82	18.4	1.00
Always/Usually	156	40	25.6	1.39 (1.00–1.93)
Standing position
Never/Rarely	142	26	18.3	1.00
Always/Usually	458	96	21.0	1.14 (0.77 -1.69)
Standing and leaning
Never/Rarely	309	56	18.1	1.00
Always/Usually	291	66	22.7	1.25 (0.91–1.72)

PR, prevalence ratios; CI, confidence intervals.