Table 3. Work-related injuries in construction, by occupational factors, 1988–2000.
| Injury incidence ratea | |||||
| 95% CI | |||||
| Occupational factors | % of sample | Point estimate | Lower | Upper | P valueb |
| Occupation | < 0.001 | ||||
| Blue-collar | 80.2% | 11.9 | 10.7 | 13.0 | |
| White-collar | 19.8% | 6.6 | 4.8 | 8.4 | |
| Number of jobs per year (mean: 2.0 jobs) | < 0.001 | ||||
| 1 job | 30.2% | 10.5 | 8.7 | 12.3 | |
| 2 jobs | 50.5% | 9.6 | 8.2 | 10.9 | |
| 3–4 jobs | 18.3% | 14.6 | 11.9 | 17.2 | |
| 5+ jobs | 0.9% | 22.4 | 8.9 | 35.9 | |
| Hours worked per day in primary job (mean: 8.7 hours) | 0.003 | ||||
| ≤ 8 hours | 62.9% | 9.4 | 8.2 | 10.6 | |
| 8.1–10 hours | 28.5% | 13.2 | 11.1 | 15.3 | |
| >10 hours | 8.6% | 12.7 | 8.9 | 16.4 | |
| Weeks worked per year (mean: 45.0 weeks) | 0.019 | ||||
| ≤ 26 weeks | 10.3% | 9.8 | 6.9 | 12.7 | |
| 27–48 weeks | 21.7% | 13.5 | 11.1 | 15.8 | |
| 49–52 weeks | 68.0% | 10.1 | 8.9 | 11.3 | |
| Physical efforts | 0.018 | ||||
| All or most of the time | 68.9% | 11.0 | 9.6 | 12.3 | |
| Some of the time | 20.7% | 10.6 | 8.1 | 13.1 | |
| None or almost none of the time | 10.3% | 5.7 | 3.1 | 8.2 | |
| Lifting/stooping/kneeling | 0.070 | ||||
| Most/all of the time/5–7 days a week | 59.7% | 11.2 | 9.9 | 12.5 | |
| Moderate amount/some of the time/1–4 days a week | 32.0% | 10.7 | 9.0 | 12.4 | |
| Rarely/none of the time/ < 1 day a week | 8.3% | 6.7 | 3.8 | 9.7 | |
| Job physical activity index (mean: 6.1) | 0.027 | ||||
| 0 | 10.6% | 6.1 | 3.5 | 8.7 | |
| 1–3 | 8.5% | 8.6 | 5.1 | 12.2 | |
| 4–6 | 17.7% | 12.2 | 9.4 | 15.0 | |
| 7–9 | 63.2% | 10.8 | 9.4 | 12.2 | |
| Total | 100% | 10.8 | 9.8 | 11.8 | … |
Note:
aInjury incidence rate = number of injuries per 100 observations.
bP value represents chi-square tests comparing differences in injury rates by occupational factors. Numbers are weighted.