Table 1.
Study participants’ characteristics at baseline in placebo (n = 103) and nortriptyline (n = 102) groups
| Characteristic | Placebo | Nortriptyline |
|---|---|---|
| Mean age, years (SD) | 64.6 (10.3) | 64.4 (7.9) |
|
| ||
| Female, n (%) | 43 (41.7) | 44 (43.1) |
|
| ||
| Ethnicity, n (%)a | ||
| European | 87 (84.5) | 96 (94.1) |
| Māori | 9 (8.7) | 12 (11.8) |
| Other | 11 (10.7) | 5 (4.9) |
|
| ||
| BMI (kg/m2), mean (SD) | 31.3 (6.2) | 33.2 (5.7) |
| Healthy: 18–<25, n (%) | 6 (5.8) | 7 (6.9) |
| Overweight: 25–<30, n (%) | 48 (46.6) | 20 (19.6) |
| Obese: ≥30, n (%) | 49 (47.6) | 75 (73.5) |
|
| ||
| Years with knee OA, mean (SD) | 6.6 (7.1) | 8.5 (7.9) |
|
| ||
| Use of assistive device, n (%) | 39 (37.9) | 41 (40.2) |
|
| ||
| Chronic conditions, n (%) | 60 (58.3) | 61 (59.8) |
a
Ethnicity was self-identified; participants could select >1 ethnicity, so totals may add to >100%. BMI = body mass index. OA = osteoarthritis. SD = standard deviation.