Table 2.
Association between radiographic knee OA and the presence of frequent knee pain in five racial/ethnic populationsa.
| Racial/ethnic origin (study) | Frequent knee pain | Kellgren and Lawrence grade | |||
|---|---|---|---|---|---|
| 0 | 1 | 2 | 3–4 | ||
| Urban Chinese | No | 141 (56.0) | 48 (19.0) | 38 (15.1) | 25 (10.0) |
| (BOA) | Yes | 113 (44.8) | 54 (21.4) | 38 (15.1) | 47 (18.7) |
| OR (95% CI) | 1 | 1.9 (0.9, 3.7) | 6.8 (2.6, 17.8) | 16.8 (5.3, 53.2) | |
| Rural Chinese | No | 194 (87.8) | 9 (4.1) | 14 (6.3) | 4 (1.8) |
| (WOA) | Yes | 180 (81.4) | 12 (5.4) | 22 (10.0) | 7 (3.2) |
| OR (95% CI) | 1 | 2.1 (0.9, 5.0) | 3.8 (1.1, 12.9) | 9.4 (1.7, 52.5) | |
| Japanese | No | 27 (9.1) | 87 (29.3) | 126 (42.4) | 57 (19.2) |
| (ROAD) | Yes | 23 (7.7) | 62 (20.9) | 111 (37.4) | 101 (34.0) |
| OR (95% CI) | 1 | 1.1 (0.3, 3.9) | 3 (0.8, 11.6) | 24.2 (4.8, 121.8) | |
| Koreans | No | 32 (32.7) | 41 (41.8) | 20 (20.4) | 5 (5.1) |
| (HAS) | Yes | 25 (25.5) | 37 (37.8) | 28 (28.6) | 8 (8.2) |
| OR (95% CI) | 1 | 2.3 (0.9, 6.0) | 6.6 (1.7, 26.2) | 10 (2.0, 49.9) | |
| African-Americans | No | 75 (35.4) | 36 (17.0) | 73 (34.4) | 28 (13.2) |
| (OAI) | Yes | 57 (26.9) | 28 (13.2) | 75 (35.4) | 52 (24.5) |
| OR (95% CI) | 1 | 1.7 (0.9, 3.3) | 3.5 (1.7, 7.3) | 8.5 (3.6, 20.3) | |
| Caucasians | No | 358 (42.9) | 197 (23.6) | 179 (21.4) | 101 (12.1) |
| (OAI) | Yes | 249 (29.8) | 142 (17.0) | 183 (21.9) | 261 (31.3) |
| OR (95% CI) | 1 | 1.8 (1.3, 2.4) | 3.7 (2.6, 5.1) | 15.8 (10.1, 24.8) | |
N(%), Abbreviations: CI, Confidence interval.
Conditional logistic regression results for subjects with knees discordant for the presence of frequent knee pain.
Subjects included in Table 2 with bilateral knee pain of discrepant severity (in the HAS and OAI studies) were excluded.
Abbreviations: BOA, Beijing Osteoarthritis Study, China; WOA, Wuchuan Osteoarthritis Study, China; ROAD, Research on Osteoarthritis/osteoporosis Against Disability Study, Japan; HAS, Hallym Aging Study, South Korea; OAI, Osteoarthritis Initiative, United States; OR, odds ratio; CI, confidence interval.