Table 3 Prevalence Ratios with 95% confidence interval considering arm pain (n = 14,327)

Age

Per year

1.020 (1.016–1.023)

Gender

Women

1.454 (1.353–1.562)

Weekly working hours

Per h

0.987 (0.982–0.992)

Psychosocial workload (score)

Per unit

1.011 (1.008–1.014)

Never

Rarely

Sometimes

Often

Works in awkward postures

1 (ref.)

0.907 (0.809–1.016)

1.100 (0.984–1.230)

(answer split into 3 dummy variables)

1) Often performs overhead work

1 (ref.)

–

–

1.181 (1.037–1.345)

2) Often when bending

1 (ref.)

–

–

1.191 (1.050–1.351)

3) Often when kneeling

1 (ref.)

–

–

0.995 (0.874–1.132)

Manual handling of heavy loads

1 (ref.)

1.072 (0.957–1.200)

1.176 (1.033–1.339)

1.531 (1.359–1.724)

Manual handling operations

1 (ref.)

1.025 (0.879–1.195)

1.150 (1.001–1.320)

1.712 (1.534–1.911)

Climatic workload

1 (ref.)

1.063 (0.938–1.206)

1.296 (1.165–1.442)

1.646 (1.490–1.818)