Table 6.

Prevalence Ratios (PR) of the 7-day prevalence of symptoms

Body regions by gender*	Risk category 1 (Reference) Employees in jobs with low MHO, < 10 points KIM-MHO	Risk category 2 Employees in jobs with MHO, 10 – 24 points KIM-MHO	Risk category 3 Employees in jobs with MHO, 25 – 49 points KIM-MHO	Risk category 4 Employees in jobs with MHO, ≥ 50 points KIM-MHO
Women	n = 306	n = 75	n = 59	n = 73
neck/cervical spine	1 (ref.)	0.8 (0.5 – 1.3)	1.5 (1.0 – 2.1)	1.8 (1.3 – 2.3)
shoulder/upper arm	1 (ref.)	1.0 (0.6 – 1.6)	1.8 (1.2 – 2.7)	1.9 (1.3 – 2.8)
elbow/forearm	1 (ref.)	0.6 (0.1 – 2.8)	3.3 (1.5 – 7.2)	4.5 (2.3 – 8.7)
hand/wrist	1 (ref.)	0.5 (0.2 – 1.7)	3.0 (1.7 – 5.3)	4.2 (2.6 – 6.9)
lower back/lumbar spine	1 (ref.)	0.8 (0.4 – 1.7)	2.5 (1.6 – 4.0)	2.2 (1.4 – 3.5)
Men	n = 498	n = 173	n = 23	n = 239
neck/cervical spine	1 (ref.)	0.8 (0.5 – 1.2)	1.0 (0.4 – 2.5)	1.2 (0.9 – 1.7)
shoulder/upper arm	1 (ref.)	0.8 (0.5 – 1.3)	2.3 (1.2 – 4.4)	1.9 (1.3 – 2.7)
elbow/forearm	1 (ref.)	0.9 (0.4 – 1.9)	2.4 (0.8 – 7.3)	3.3 (2.1 – 5.4)
hand/wrist	1 (ref.)	1.2 (0.6 – 2.3)	5.5 (2.7 – 11.3)	5.5 (3.5 – 8.5)
lower back/lumbar spine	1 (ref.)	1.6 (0.9 – 2.7)	4.9 (2.5 – 9.4)	4.7 (3.1 – 7.1)

*Prevalence Ratios of symptoms stratified by exposure to manual handling operations (MHO) according to KIM-MHO risk categories. Significant values are marked in bold letters

[Prevalence Ratios, 95%-CI. Log-linear Poisson regression, robust estimation of variance. One model per body region stratified by gender. Each model adjusted by age, body-mass-index and body height]