Table 4 Univariate and multivariate risk ratios (95% CIs) of the association between sex specific tertiles of physical capacity and neck pain, SMASH, 1994–97 (n = 1269).
| Physical capacity | Total events/total number at risk* | Crude RR (95% CI)† | Adjusted RR (95% CI) |
|---|---|---|---|
| Isokinetic lifting strength | High (59/1030) | 1.00 | 1.00‡ |
| neck/shoulder muscles | Moderate (60/1084) | 1.27 (0.99 to 1.64) | 1.21 (0.94 to 1.55) |
| Low (59/1039) | 1.45 (1.14 to 1.84) | 1.31 (1.03 to 1.67) | |
| Static endurance neck flexors | High (47/1099) | 1.00 | 1.00§ |
| Moderate (76/1174) | 1.24 (0.97 to 1.59) | 1.15 (0.94 to 1.40) | |
| Low (64/1152) | 1.70 (1.34 to 2.14) | 1.22 (1.00 to 1.49) |
*Summarisation of occurrence annually during follow up divided by a summarisation of all workers at risk annually during follow up.
†RR, risk ratio; CI, confidence interval. Including the covariate duration of follow up.
‡Adjusted for duration of follow up, age, and length.
§Adjusted for duration of follow up, age, comorbidity of low back or shoulder pain, and previous neck pain.