Cumulative ORs (CORs, 95% CIs) for back pain by baseline sociodemographic factors, body mass index and psychosocial working conditions
| Covariate/factor | Back pain | |
| COR* | 95% CI | |
| Sex (n=8665) | ||
| Male | 1 | |
| Female | 1.73 | 1.59 to 1.89 |
| Age (years, n=8665) | ||
| 30–39 | 1 | |
| 40–49 | 1.13 | 1.03 to 1.25 |
| ≥50 | 1.18 | 1.06 to 1.33 |
| Occupational grade (n=8665) | ||
| High (administrative) | 1 | |
| Middle (professionals/executive) | 1.20 | 1.09 to 1.33 |
| Low (clerical/support) | 1.39 | 1.22 to 1.59 |
| Parents’ education (n=7751) | ||
| High | 1 | |
| Intermediate | 1.21 | 1.06 to 1.39 |
| Low | 1.19 | 1.07 to 1.34 |
| Body mass index (n=8654) | ||
| Recommended weight | 1 | |
| Overweight or obese | 1.14 | 1.04 to 1.24 |
| Job control (n=8593) | ||
| High | 1 | |
| Low | 1.06 | 0.95 to 1.18 |
| Job demands (n=8621) | ||
| Low | 1 | |
| High | 1.19 | 1.07 to 1.33 |
*Adjusted for sex and age.