Table 1 Characteristics of the study sample for knee synovial abnormalities on ultrasound
|  | Total (n = 3,405) | Hyperuricemia (n = 551) | Normouricemia (n = 2,854) |
|---|---|---|---|
Women, n (%) | 1,940 (57.0) | 272 (49.4) | 1,668 (58.4) |
Age, years (mean ± SD) | 64.5 ± 9.3 | 66.9 ± 9.8 | 64.0 ± 9.1 |
 50–59 | 33.6 | 26.9 | 34.9 |
 60–69 | 35.9 | 33.2 | 36.4 |
 ≥70 | 30.5 | 39.9 | 28.7 |
Height, cm (mean ± SD) | 151.1 ± 8.0 | 151.7 ± 8.4 | 151.0 ± 7.9 |
Weight, kg (mean ± SD) | 54.9 ± 10.0 | 56.6 ± 11.6 | 54.6 ± 9.6 |
BMI, kg/m2(mean ± SD) | 24.0 ± 3.5 | 24.5 ± 3.9 | 23.9 ± 3.5 |
Smoking status (%) | Â | Â | Â |
 Non-smoker | 64.8 | 58.5 | 66.0 |
 Ex-smoker | 4.6 | 7.6 | 4.0 |
 Current smoker | 30.6 | 33.9 | 30.0 |
Alcohol drinking (%) | Â | Â | Â |
 Non-drinker | 53.5 | 46.3 | 54.9 |
 Ex-drinker | 11.5 | 17.2 | 10.4 |
 Current drinker | 35.0 | 36.5 | 34.7 |
Education (educated, %)* | 67.6 | 67.9 | 67.6 |
Knee injury history (%)†| 3.1 | 3.0 | 3.1 |
Diabetes (%) | 8.8 | 12.9 | 8.0 |
Hypertension (%) | 58.8 | 69.9 | 56.6 |
Serum creatinine (µmol/L) | 57.9 ± 32.4 | 72.2 ± 39.4 | 55.1 ± 30.2 |