Table 1 Characteristics of study subjects
From: Prevalence of low back pain and associated occupational factors among Chinese coal miners
Individual Characteristics | With LBP (N = 997) | Without LBP(N = 540) | P |
|---|---|---|---|
Age(yrs) | 36.8 ± 15.1, M = 37 | 32.3 ± 18.1, M = 40 | < 0.001 |
Height(m) | 1.71 ± 0.05 | 1.70 ± 0.06 | 0.45 |
Weight(kg) | 71.1 ± 10.0 | 70.9 ± 10.0 | 0.53 |
BMI(kg/m2.) | 24.0 ± 4.4 | 24.2 ± 3.8 | 0.22 |
Seniority in current job(yrs) | 12.8 ± 10.1, M = 6 | 11.5 ± 10.2, M = 10 | 0.02 |
Working hours per week | 52.1 ± 9.7, M = 48 | 49.9 ± 9.2, M = 50 | 0.007 |
Left-handed n(%) | 135(13.5%) | 71(13.1%) | 0.69 |
Smoking n(%) | 541(54.3%) | 290(53.7%) | 0.73 |
Education level n(%) | Â | Â | < 0.001 |
High | 100(10.0%) | 106(19.6%) | Â |
Medium | 206(20.7%) | 117(21.7%) | Â |
Low | 636(63.8%) | 294(54.4%) | Â |
Very low | 53(5.7%) | 21(3.9%) | Â |