Shoulder disorders in relation to lifetime upper arm elevation above 90°; total study population (n = 1886)
| Lifetime exposure (mth) | Dominant shoulder | Lifetime exposure (mth) | Non-dominant shoulder | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | c | % | ORcrude | ORadj | 95% CI | n | c | % | ORcrude | ORadj | 95% CI | ||
| n, number of subjects; c, number of cases; %, prevalence, ORcrude, unadjusted odds ratio; ORadj, adjusted odds ratio (adjusted for 10 year age categories (30–40, 40–50, 50–60, 60–70) and categorised pack-years of smoking (0, 0–20, 20); age and smoking categories include the lower limit and exclude the upper limit). | |||||||||||||
| Subjects were classified as right handed if they used both hands equally well. | |||||||||||||
| In analyses for the non-dominant shoulder, 14 subjects with lifetime upper arm elevation ⩾24 months were included in the category ⩾12 months. Two of these subjects had shoulder pain with disability, none of them had shoulder tendinitis or shoulder pain without disability | |||||||||||||
| Exposure categories include the lower limit and exclude the upper limit. | |||||||||||||
| Supraspinatus tendinitis | |||||||||||||
| 0–6 | 491 | 10 | 2.0 | 1.00 | 1.00 | – | 0–6 | 429 | 3 | 0.7 | 1.00 | 1.00 | – |
| 6–12 | 427 | 7 | 1.6 | 0.80 | 0.73 | 0.27 to 1.94 | 6–12 | 682 | 8 | 1.2 | 1.69 | 0.97 | 0.25 to 3.85 |
| 12–24 | 519 | 14 | 2.7 | 1.33 | 1.30 | 0.57 to 2.99 | ⩾12 | 686 | 7 | 1.0 | 1.46 | 0.54 | 0.13 to 2.24 |
| ⩾24 | 315 | 17 | 5.4 | 2.74 | 1.87 | 0.79 to 4.44 | |||||||
| Trend analysis (for an increment of 6 months): | Trend analysis (for an increment of 6 months): | ||||||||||||
| ORadj 1.14 (95% CI 0.97 to 1.35) | ORadj 0.64 (95% CI 0.39 to 1.08) | ||||||||||||
| Shoulder pain with disability | |||||||||||||
| 0–6 | 486 | 23 | 4.7 | 1.00 | 1.00 | – | 0–6 | 428 | 7 | 1.6 | 1.00 | 1.00 | – |
| 6–12 | 423 | 21 | 5.0 | 1.05 | 1.04 | 0.56 to 1.93 | 6–12 | 682 | 23 | 3.4 | 2.10 | 1.43 | 0.59 to 3.43 |
| 12–24 | 517 | 45 | 8.7 | 1.92 | 1.75 | 1.03 to 2.97 | ⩾12 | 685 | 44 | 6.4 | 4.13 | 1.93 | 0.81 to 4.57 |
| ⩾24 | 313 | 49 | 15.7 | 3.74 | 2.23 | 1.28 to 3.88 | |||||||
| Trend analysis (for an increment of 6 months): | Trend analysis (for an increment of 6 months): | ||||||||||||
| ORadj 1.18 (95% CI 1.06 to 1.30) | ORadj 1.26 (95% CI 0.97 to 1.64) | ||||||||||||
| Shoulder pain without disability | |||||||||||||
| 0–6 | 486 | 54 | 11.1 | 1.00 | 1.00 | – | 0–6 | 428 | 34 | 8.0 | 1.00 | 1.00 | – |
| 6–12 | 423 | 50 | 11.8 | 1.07 | 1.11 | 0.74 to 1.70 | 6–12 | 682 | 59 | 8.3 | 1.10 | 1.10 | 0.71 to 1.71 |
| 12–24 | 517 | 88 | 17.0 | 1.64 | 1.68 | 1.16 to 2.44 | ⩾12 | 685 | 67 | 9.8 | 1.26 | 1.39 | 0.82 to 1.93 |
| ⩾24 | 313 | 48 | 15.3 | 1.45 | 1.85 | 1.16 to 2.94 | |||||||
| Trend analysis (for an increment of 6 months): | Trend analysis (for an increment of 6 months): | ||||||||||||
| ORadj 1.16 (95% CI 1.06 to 1.27) | ORadj 1.19 (95% CI 0.97 to 1.46) | ||||||||||||