Table 4 Multivariable analysis of the individual predictors of work-related musculoskeletal disorders
Individual factors | Self-reported WRMSDs in the past 12 months (%) | Unadjusted Model | Adjusted model | |||
|---|---|---|---|---|---|---|
Yes (n = 49) | No (n = 147) | PR | [95% CI] | PR | [95% CI] | |
Age in years | ||||||
  < 30 | 9 (24.3) | 28 (75.7) | 1 |  | 1 |  |
 30–34 | 12 (22.2) | 42 (77. 8) | 0.91 | [0.43, 1.95] | 0.95 | [0.47, 1.91] |
 35–39 | 8 (16.7) | 40 (83.3) | 0.69 | [0.29, 1.61] | 0.75 | [0.33, 1.68] |
  ≥ 40 | 20 (35.1) | 37 (64.9) | 1.44 | [0.74, 2.82] | 1.63 | [0.86, 3.09] |
Department | ||||||
 Mining | 13 (43.3) | 17 (56.7) | 1 |  |  |  |
 Engineering | 12 (37.5) | 20 (62.5) | 0.87 | [0.47, 1.59] |  |  |
 Maintenance | 3 (8.8) | 31 (91.2) | 0.20 | [0.06, 0.65]** |  |  |
 Metallurgy | 8 (26.7) | 22 (73.3) | 0.54 | [0.26, 1.13] |  |  |
 Mineral Resources | 12 (36.4) | 21 (63.6) | 0.84 | [0.46, 1.55] |  |  |
 Others | 1 (3.0) | 32 (97.0) | 0.70 | [0.01, 0.51]** |  |  |
Level of education | ||||||
 Primary | 5 (29.4) | 12 (70.6) | 1 |  |  |  |
 Secondary | 18 (21.7) | 65 (78.3) | 0.74 | [0.32, 1.72] |  |  |
 Tertiary | 24 (25.5) | 70 (74.5) | 0.87 | [0.38, 1.96] |  |  |
Sex | ||||||
 Male | 48 (25.7) | 139 (74.3) | 1 |  |  |  |
 Female | 1 (11.1) | 8 (88. 9) | 0.43 | [0.07, 2.80] |  |  |
Experiencein mining | ||||||
 1–5 years | 29 (20.4) | 113 (79.6) | 1 |  | 1 |  |
  > 5 years | 20 (37.0) | 34 (63.0) | 1.81 | [1.13, 2.92]* | 1.39 | [0.88, 2.18] |