Exposure to work tasks which were evaluated as potential risk factors and association with 1 year prevalence of low back pain at follow up among the cohort without low back pain at baseline (n=230)
| Group of work tasks; specific task |
Exposure mean h/8h shift ÷ 8 (SD) | Association with low back pain PR (95% CI)3-150 |
| General tasks3-151: | ||
| Pointing up | 0.044 (0.137) | 0.1 (0.0 to 3.3) |
| Supportive tasks | 0.084 (0.159) | 0.3 (0.0 to 2.7) |
| Supervision | 0.098 (0.198) | 0.3 (0.1 to 1.6) |
| Impregnation | 0.044 (0.108) | 0.8 (0.1 to 8.5) |
| Driving trucks | 0.056 (0.149) | 0.8 (0.2 to 3.7) |
| Transport of material | 0.131 (0.15) | 1.2 (0.2 to 5.7) |
| Loading of material | 0.062 (0.070) | 1.7 (0.1 to 52.7) |
| Scaffolding | 0.034 (0.058) | 15.4 (0.5 to 471.0) |
| Tasks specific to carpenters/concrete builders3-152: | ||
| Setting up form work | 0.085 (0.219) | 0.9 (0.3 to 3.1) |
| Concrete distribution | 0.311 (0.082) | 1.8 (0.1 to 30.2) |
| 1st, 2nd, and 3rd fixings | 0.087 (0.199) | 2.3 (0.9 to 6.2) |
| Sawing wood | 0.025 (0.079) | 5.2 (0.4 to 74.0) |
| Erecting roof structures | 0.029 (0.090) | 6.0 (0.8 to 44.7) |
| Tasks specific to house painters3-153: | ||
| Stripping colour or wall paper | 0.055 (0.137) | 0.2 (0.0 to 2.3) |
| Hanging wall paper | 0.091 (0.201) | 0.3 (0.0 to 1.1) |
| Painting by rolling | 0.099 (0.195) | 0.7 (0.0 to 2.7) |
| Painting by brushing | 0.085 (0.175) | 0.8 (0.2 to 3.4) |
| Tasks specific to bricklayers3-154: | ||
| Repairing walls | 0.017 (0.077) | 0.4 (0.0 to 20.0) |
| Laying face bricks | 0.014 (0.078) | 1.0 (0.1 to 19.4) |
| Building walls | 0.103 (0.214) | 1.6 (0.5 to 4.6) |
| Laying lintels or sills | 0.065 (0.141) | 1.7 (0.3 to 8.7) |
| Mixing mortar | 0.033 (0.085) | 2.1 (0.2 to 25.9) |
| Plastering | 0.012 (0.072) | 2.1 (0.1 to 40.6) |
| Demolition | 0.008 (0.056) | 3.6 (0.3 to 52.0) |
| Laying specific brick formats3-160: | ||
| Clinker (0.8 to 1.4 kg) | 0.068 (0.161) | 0.9 (0.2 to 4.7) |
| 2DF sandstone (4 to 6.5 kg) | 0.085 (0.176) | 2.4 (0.7 to 8.1) |
| 3DF sandstone (7 to 10 kg) | 0.064 (0.145) | 3.5 (0.9 to 12.8) |
↵3-150 PR (95% CI) for a duration of 8 hours during an average 8 hour shift adjusted for age (⩽25/>25–30/>30–35/>35–40/>40–45/>45–50/>50 years), sitting height (cm), and body mass index (kg/m2).
↵3-151 Pearson correlation coefficient 0.48 (supervision and supportive tasks), 0.39 (transport of material and loading of material).
↵3-152 Pearson correlation coefficient 0.77 (sawing wood and erecting roof structures), 0.47 (1st, 2nd, and 3rd fixings and erecting roof structures), 0.40 (1st, 2nd, and 3rd fixings and sawing wood.)
↵3-153 Pearson correlation coefficients: 0.79 (hanging wall paper and painting by brushing), 0.79 (painting by rolling and painting by brushing), 0.72 (hanging wall paper and painting by rolling), 0.66 (hanging wall paper and stripping colour or wall paper), 0.66 (painting by rolling and stripping colour or wall paper, 0.58 (painting by brushing and stripping colour or wall paper).
↵3-154 Pearson correlation coefficient 0.68 (building walls and laying lintels or sills).
↵3-160 Pearson correlation coefficient 0.88 (2DF sandstone and 3DF sandstone), 0.48 (2DF sandstone and clinker), 0.39 (clinker and 3DF sandstone).