Table 3 Results of multiple regression analyses of questionnaire computer, mouse and keyboard times (h/w or proportions) versus the corresponding WPR‐variables, arm pain status, gender, age, psychosocial work place factors and personality factors.
| Final model* | Estimate (95% CI) | p Value |
|---|---|---|
| Computer time (h/w), adj R2 = 0.30 SD† = 5.7 | ||
| Intercept | 15.0 (12.6 to 17.3) | <0.001 |
| WPR‐computer time | 1.31 (1.06 to 1.57) | <0.001 |
| WPR‐computer time squared | −0.029 (–0.039 to −0.019) | <0.001 |
| WPR‐computer time, SD | 0.43 (0.26 to 0.61) | <0.001 |
| Maximum pain (elbow, forearm wrist) (0−7) | 0.22 (0.02 to 0.42) | 0.035 |
| Female | 1.46 (0.73 to 2.20) | <0.001 |
| Age (effect of 10 years) | −0.73 (−1.11 to −0.36) | <0.001 |
| Mouse time (h/w), adj R2 = 0.38 SD† = 6.5 | ||
| Intercept | 5.8 (3.5 to 8.1) | <0.001 |
| WPR‐mouse time | 2.02 (1.71 to 2.33) | <0.001 |
| WPR‐mouse time squared | −0.059 (−0.076 to −0.043) | <0.001 |
| WPR‐mouse time, SD | 0.53 (0.25 to 0.81) | <0.001 |
| Maximum pain (elbow, forearm wrist) (0−7) | 0.34 (0.10 to 0.58) | 0.005 |
| Female | 0.80 (−0.03 to 1.64) | 0.060 |
| Age (effect of 10 years) | −0.63 (−1.06 to −0.21) | 0.004 |
| Keyboard time (h/w), adj R2 = 0.16 SD† = 5.0 | ||
| Intercept | 3.3 (1.6 to 5.0) | <0.001 |
| WPR‐keyboard time | 2.57 (1.96 to 3.18) | <0.001 |
| WPR‐keyboard time squared | −0.18 (−0.26 to −0.10) | <0.001 |
| WPR‐keyboard time, SD | 0.94 (0.13 to 1.75) | 0.022 |
| Maximum pain (elbow, forearm wrist) (0−7) | −0.24 (−0.43 to −0.06) | 0.011 |
| Female | 0.92 (0.27 to 1.57) | 0.005 |
| Age (effect of 10 years) | 0.38 (0.05 to 0.72) | 0.026 |
| Low self‐efficacy | −0.78 (−1.52 to −0.04) | 0.038 |
| Computer time (proportion), adj R2 = 0.34 SD† = 0.17 | ||
| Intercept | 0.44 (0.37 to 0.51) | <0.001 |
| WPR‐computer proportion | 1.75 (1.48 to 2.02) | <0.001 |
| WPR‐computer proportion squared | −1.56 (−1.93 to −1.18) | <0.001 |
| WPR‐computer proportion, SD | 0.36 (0.17 to 0.55) | <0.001 |
| Maximum pain (elbow, forearm wrist) (0−7) | 0.009 (0.003 to 0.016) | 0.004 |
| Female | 0.067 (0.045 to 0.089) | <0.001 |
| Age (effect of 10 years) | −0.028 (−0.039 to −0.017) | <0.001 |
| High demands | 0.022 (0.002 to 0.042) | 0.035 |
| Mouse time (proportion), adj R2 = 0.32 SD† = 0.21 | ||
| Intercept | 0.25 (0.13 to 0.38) | <0.001 |
| WPR‐mouse proportion | 0.44 (0.05 to 0.83) | 0.027 |
| WPR‐mouse proportion squared | 0.40 (0.05 to 0.76) | 0.026 |
| Maximum pain (elbow, forearm wrist) (0−7) | 0.010 (0.003 to 0.018) | 0.010 |
| Age (effect of 10 years) | −0.023 (−0.037 to −0.010) | <0.001 |
| Keyboard time (proportion), adj R2 = 0.33 SD† = 0.18 | ||
| Intercept | 0.004 (−0.062 to 0.069) | 0.92 |
| WPR‐keyboard proportion | 1.95 (1.61 to 2.29) | <0.001 |
| WPR‐keyboard proportion squared | −1.53 (−2.30 to −0.76) | <0.001 |
| Maximum pain (elbow, forearm wrist) (0−7) | −0.012 (−0.019 to −0.005) | <0.001 |
| Age (effect of 10 years) | 0.036 (0.024 to 0.048) | <0.001 |
| Low self‐efficacy | −0.033 (−0.061 to −0.006) | 0.016 |
*Excluding factors with no significant effects at p⩽0.10.
†SD is the standard deviation of the differences between predicted and observed values of the dependent variable.