Table 3 Background characteristics
|  | Responders (n = 188) | Missing (n) | All (n = 503) | Missing (n) |
|---|---|---|---|---|
Age (mean, SD), years | 62, 8.5 | 15 | 62, 8 | 1 |
Gender (n, %), male | 84 (48%) | 15 | 230 (46%) | 1 |
Private Health Insurance (n, %) | 108 (62%) | 13 | 308 (61%) | 0 |
Health Care Concession (n, %) | 18 (10%) | 13 | 56 (11%) | 0 |
Co-morbidity with treatment (n,%) | ||||
Hypertension or Heart Disease | 90 (52%) | 15 | 213 (45%) | 1 |
Ulcer or Stomach Disease | 13 (7.5%) | 15 | 46 (9%) | 1 |
Kidney or Liver Disease | 0 (0%) | 15 | 4 (1%) | 1 |
Symptom duration (≤5 years) (n, %) | 92 (52%) | 13 | 281 (56%) | 0 |
WOMAC Pain (mean, sd) | 4.1 (3.6) | 0 | 4.2 (3.5) | 0 |
WOMAC Physical (mean, sd) | 15.9 (14.0) | 0 | 17.0 (13.3) | 0 |
Global assessment (mean (SD)) | 1.6 (1.0) | 18 | 1.8 (1.1) | 48 |
SF12 MCS (mean, SD) | 52.7 (10.3) | 13 | 53.5 (9.4) | 0 |
SF12 PCS (mean, SD) | 46.3 (9.4) | 13 | 44.4 (9.5) | 0 |
Glucosamine/chondroitin prior (n, %) | 61 (35%) | 13 | 154 (31%) | 0 |
Current < daily/when required medication use | 5 (3%) | 13 | 38 (8%)* | 0 |
Adherence (study treatment) < 100%a | 86(53%) | 3 | N/Ab | N/Ab |
Cost-related non-adherencea | 19 (10%) | 4 | N/Ab | N/Ab |
Physician Trusta (median, range) | 75 (28–100) | 0 | N/Ab | N/Ab |