Table 1.

Study participants’ characteristics at baseline in placebo (n = 103) and nortriptyline (n = 102) groups

CharacteristicPlaceboNortriptyline
Mean age, years (SD)64.6 (10.3)64.4 (7.9)
Female, n (%)43 (41.7)44 (43.1)
Ethnicity, n (%)a
  European87 (84.5)96 (94.1)
  Māori9 (8.7)12 (11.8)
  Other11 (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.