Shoulder disorders in relation to current upper arm elevation above 90° and other potential risk factors; currently employed subpopulation (3067 shoulders)
| Explanatory variables included in the model | ns* | Supraspinatus tendinitis | Shoulder pain with disability | Shoulder pain without disability | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| % | OR | 95% CI | % | OR | 95% CI | % | OR | 95% CI | ||
| ns, number of shoulders, %, percentage of shoulders with disorder; OR, odds ratio; CI, confidence interval. | ||||||||||
| *The totals may differ from the total number of shoulders due to missing values. | ||||||||||
| †Categories include the lower limit and exclude the upper limit. | ||||||||||
| ‡Subjects were classified as right handed if they used both hands equally well. | ||||||||||
| Current upper arm elevation above 90°† | ||||||||||
| 0–3% of working hours | 1316 | 1.1 | 1.00 | – | 2.7 | 1.00 | – | 9.1 | 1.00 | – |
| 3–6% of working hours | 1213 | 0.7 | 0.94 | 0.37 to 2.39 | 4.1 | 2.10 | 1.34 to 3.28 | 10.5 | 1.22 | 0.91 to 1.65 |
| 6–9% of working hours | 538 | 3.9 | 4.70 | 2.07 to 10.68 | 11.0 | 3.47 | 2.02 to 5.97 | 18.3 | 1.84 | 1.30 to 2.59 |
| Trend analysis (for an increment of 1% of working hours) | 3067 | 1.4 | 1.23 | 1.10 to 1.39 | 4.7 | 1.16 | 1.08 to 1.24 | 11.3 | 1.08 | 1.04 to 1.13 |
| Dominant shoulder‡ | ||||||||||
| No | 1551 | 0.7 | 1.00 | – | 3.0 | 1.00 | – | 8.9 | 1.00 | – |
| Yes | 1516 | 2.1 | 1.39 | 0.60 to 3.22 | 6.4 | 1.85 | 1.22 to 2.83 | 13.7 | 1.38 | 1.10 to 1.73 |
| Job demands | ||||||||||
| Low | 2238 | 1.0 | 1.00 | – | 4.1 | 1.00 | – | 11.4 | 1.00 | – |
| High | 781 | 2.6 | 3.19 | 1.62 to 6.31 | 6.2 | 1.89 | 1.25 to 2.85 | 11.9 | 1.00 | 0.73 to 1.36 |
| Job control | ||||||||||
| High | 2027 | 1.3 | 1.00 | – | 4.4 | 1.00 | – | 11.3 | 1.00 | – |
| Low | 957 | 1.6 | 1.83 | 0.93 to 3.60 | 5.0 | 1.31 | 0.87 to 1.99 | 11.3 | 1.00 | 0.75 to 1.34 |
| Social support | ||||||||||
| High | 1893 | 1.3 | 1.00 | – | 4.1 | 1.00 | – | 10.2 | 1.00 | – |
| Low | 1121 | 1.5 | 0.91 | 0.46 to 1.77 | 5.7 | 1.12 | 0.75 to 1.67 | 13.3 | 1.28 | 0.97 to 1.68 |
| Age (y)† | ||||||||||
| 30–40 | 1068 | 0.8 | 1.00 | – | 2.2 | 1.00 | – | 10.3 | 1.00 | – |
| 40–50 | 919 | 1.1 | 1.37 | 0.54 to 3.44 | 3.2 | 1.37 | 0.74 to 2.53 | 13.7 | 1.26 | 0.91 to 1.73 |
| 50–60 | 963 | 2.1 | 2.32 | 0.99 to 5.40 | 8.6 | 3.78 | 2.24 to 6.39 | 10.5 | 0.88 | 0.62 to 1.25 |
| 60–70 | 117 | 3.4 | 3.92 | 1.05 to 5.42 | 7.7 | 3.86 | 1.62 to 9.20 | 6.8 | 0.62 | 0.28 to 1.37 |
| Smoking (pack-years)† | ||||||||||
| 0 | 1114 | 1.2 | 1.00 | – | 2.6 | 1.00 | – | 9.9 | 1.00 | – |
| 0–20 | 1153 | 1.3 | 0.74 | 0.33 to 1.67 | 5.4 | 1.91 | 1.13 to 3.21 | 11.3 | 1.12 | 0.82 to 1.54 |
| ⩾20 | 800 | 1.9 | 0.99 | 0.45 to 2.18 | 6.7 | 1.76 | 1.02 to 3.02 | 13.1 | 1.35 | 0.96 to 1.90 |