Table 1.
Characteristics of Included Participants (n=4,499)
| Overall (n=4,499) | Neither Radiographic Knee OA nor Knee Pain (n=1,139) | Radiographic Knee OA Only (n=1,117) | Knee Pain Only (n=856) | Symptomatic Knee OA (n=1,387) | |
|---|---|---|---|---|---|
| Age, mean (SD), years | 61.2 (9.2) | 60.1 (9.1) | 64.0 (8.8) | 58.3 (8.9) | 61.5 (9.0) |
| Women (%) | 58.1 | 58.1 | 59.4 | 58.4 | 56.8 |
| Non-white (%) | 18.8 | 11.4 | 14.6 | 21.6 | 29.8 |
| College Graduate or Above (%) | 60.3 | 68.3 | 63.3 | 59.4 | 51.8 |
| Smoking Status (%) | |||||
| Never | 79.5 | 79.2 | 80.5 | 79.6 | 78.9 |
| Former | 17.3 | 17.4 | 16.9 | 16.9 | 17.9 |
| Current | 3.2 | 3.5 | 2.6 | 3.6 | 3.2 |
| Drinking Status (%) | |||||
| None | 18.9 | 15.3 | 17.4 | 21.1 | 21.7 |
| <1 drink/week | 37.7 | 36.5 | 38.7 | 36.9 | 38.4 |
| 1–21 drinks/week | 41.9 | 46.5 | 42.0 | 40.8 | 38.6 |
| >21 drinks/week | 1.6 | 1.8 | 1.9 | 1.2 | 1.3 |
| BMI, mean (SD), kg/m 2 | 28.6 (4.8) | 26.9 (4.4) | 29.0 (4.6) | 27.8 (4.6) | 30.2 (4.6) |
| Comorbidity Score, mean (SD) | 0.4 (0.8) | 0.3 (0.7) | 0.4 (0.8) | 0.4 (0.8) | 0.5 (0.9) |
| Depression Score, mean (SD) | 6.5 (6.9) | 5.4 (5.9) | 5.4 (5.9) | 7.3 (7.1) | 7.7 (7.8) |
| History of Knee Injury (%) | 43.4 | 32.3 | 46.0 | 40.2 | 52.0 |
| Widespread Pain (%) | 4.5 | 2.5 | 2.4 | 6.3 | 6.9 |
| Disability Score, mean (SD) | 9.5 (11.7) | 4.1 (7.1) | 6.5 (9.0) | 10.0 (11.5) | 16.0 (13.6) |
| PCS of QoL, mean (SD) | 47.7 (9.7) | 50.7 (8.4) | 48.9 (8.9) | 47.7 (9.8) | 44.0 (10.0) |
| MCS of QoL, mean (SD) | 53.7 (8.5) | 54.1 (7.7) | 54.4 (7.8) | 53.1 (8.7) | 53.3 (9.3) |
| Oral Pain Medications Use (%) | 31.7 | 21.8 | 28.0 | 31.2 | 43.2 |
| Death (%) | 6.3 | 6.3 | 6.5 | 5.0 | 6.9 |
n, number; OA, osteoarthritis; SD, standard deviation; BMI, body mass index; PCS, physical component summary score; MCS, mental component summary score; QoL, quality of life.