Combined physical strain with adjusted odds ratios (OR) with 95% confidence intervals (CI) for tennis elbow among 483 employees
| Strain | Model I* | Model II† | Model II† | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Female | Male | |||||||||||
| n | OR | 95% CI | n | OR | 95% CI | n | OR | 95% CI | n | OR | 95% CI | |
| n, number of persons in the exposed group. | ||||||||||||
| *Adjusted for age, gender, and body mass index. | ||||||||||||
| †Mutual adjustment and adjusted for age, gender, body mass index, social support, job demands, and job control. | ||||||||||||
| Repetition (R) and force (F) | ||||||||||||
| Low repetition and low force | 111 | 1.0 | 102 | 1.0 | 61 | 1.0 | 41 | 1.0 | ||||
| Low repetition and high force | 48 | 1.7 | 0.9 to 3.5 | 45 | 1.5 | 0.7 to 3.2 | 22 | 0.8 | 0.3 to 2.6 | 23 | 2.3 | 0.8 to 7.1 |
| High repetition and low force | 200 | 1.4 | 0.9 to 2.3 | 187 | 1.1 | 0.6 to 1.9 | 115 | 0.5 | 0.2 to 1.2 | 72 | 2.0 | 0.8 to 4.8 |
| High repetition and high force | 116 | 3.9 | 2.2 to 6.9 | 107 | 2.5 | 1.3 to 4.9 | 46 | 1.8 | 0.7 to 5.0 | 61 | 3.5 | 1.3 to 9.1 |
| Extreme position (P) | – | – | – | 225 | 1.6 | 1.0 to 2.7 | 120 | 2.9 | 1.4 to 6.0 | 105 | 1.0 | 0.5 to 2.0 |
| Repetition (R) and posture (P) | ||||||||||||
| Low repetition and neutral posture | 119 | 1.0 | 110 | 1.0 | 66 | 1.0 | 44 | 1.0 | ||||
| Low repetition and extreme posture | 40 | 2.3 | 1.1 to 4.8 | 37 | 1.6 | 0.7 to 3.7 | 17 | 4.4 | 1.2 to 15.9 | 20 | 0.8 | 0.3 to 2.8 |
| High repetition and neutral posture | 112 | 1.1 | 0.6 to 2.0 | 106 | 1.3 | 0.7 to 2.3 | 58 | 1.1 | 0.5 to 2.6 | 48 | 1.6 | 0.6 to 3.8 |
| High repetition and extreme posture | 204 | 3.0 | 1.9 to 4.9 | 188 | 2.1 | 1.2 to 2.6 | 103 | 2.4 | 1.1 to 5.3 | 85 | 1.7 | 0.7 to 4.0 |
| High force (F) | – | – | – | 152 | 2.0 | 1.3 to 3.2 | 68 | 2.0 | 1.0 to 4.0 | 84 | 1.9 | 1.0 to 3.6 |
| Force (F) and posture (P) | ||||||||||||
| Low force and neutral posture | 190 | 1.0 | 177 | 1.0 | 108 | 1.0 | 69 | 1.0 | ||||
| Low force and extreme posture | 121 | 2.2 | 1.4 to 3.6 | 112 | 1.6 | 0.9 to 2.8 | 68 | 1.8 | 0.8 to 4.0 | 44 | 1.5 | 0.6 to 3.6 |
| High force and neutral posture | 41 | 1.8 | 0.9 to 3.7 | 39 | 1.9 | 0.9 to 4.0 | 16 | 0.6 | 0.1 to 2.3 | 23 | 3.3 | 1.2 to 9.3 |
| High force and extreme posture | 123 | 4.3 | 2.6 to 7.0 | 113 | 3.3 | 1.9 to 5.8 | 52 | 6.5 | 2.8 to 14.7 | 61 | 2.0 | 0.9 to 4.5 |
| High repetition (R) | – | – | – | 294 | 1.3 | 0.8 to 2.0 | 161 | 0.8 | 0.4 to 1.7 | 133 | 1.8 | 0.9 to 3.6 |