Relations between occupational load and knee pain
| Exposure | Total |
Knee pain n (%) |
Adjusted for age and sex OR (95% CI) | |||
| Lifting >25 lb (11 kg) with one hand: | Yes | 228 | 68 (30) | 1.7 (1.2 to 2.4) | ||
| No | 832 | 147 (18) | ||||
| Lifting >50 lb (23 kg) with two hands | Yes | 103 | 30 (29) | 1.6 (1.01 to 2.6) | ||
| No | 950 | 189 (20) | ||||
| Carrying >50 lb (23 kg) on one shoulder | Yes | 100 | 46 (46) | 3.5 (2.2 to 5.5) | ||
| No | 962 | 175 (18) | ||||
| Lift >25 lb (11 kg) at or above shoulder level | Yes | 146 | 49 (34) | 1.9 (1.3 to 2.9) | ||
| No | 911 | 167 (18) | ||||
| Pulling >50 lb (23 kg) | Yes | 168 | 44 (26) | 1.5 (1.04 to 2.3) | ||
| No | 892 | 174 (20) | ||||
| Pushing >100 lb (45 kg) | Yes | 136 | 32 (24) | 1.2 (0.8 to 1.9) | ||
| No | 921 | 186 (20) | ||||
| Driving ⩾15 minutes | Yes | 101 | 21 (21) | 1.0 (0.6 to 1.7) | ||
| No | 976 | 201 (21) | ||||
| Kneeling ⩾15 minutes | Yes | 158 | 45 (28) | 1.8 (1.2 to 2.6) | ||
| No | 916 | 176 (19) | ||||
| Squatting ⩾15 minutes | Yes | 151 | 35 (23) | 1.3 (0.8 to 1.9) | ||
| No | 905 | 184 (20) | ||||