Table 1

 Characteristics of subjects, by disease status (low back pain, neck/shoulder pain and low back pain, and neck/shoulder pain

CharacteristicsControlsLBPNSPLBP and NSP
LBP, low back pain; NSP, neck/shoulder pain; LBP and NSP, low back pain and neck/shoulder pain.
Women (n)98439025163
Men (n)71631910124
Total (n)170070935287
Mean age (years)40403940
Blue-collar workers (%)58635774
Job strain (%)4679
Earlier episodes of LBP or NSP (%)45707084
Depression, treated for now or earlier (%)56715