Table 2.
Characteristics of compliers and noncompliers in the intervention group and study control groups as a reference.
| Variable | Condition | Response | Compliers (LBP = 23, kOA = 20) | Noncompliers (LBP = 56, kOA = 39) | Control group (LBP = 80, kOA = 60) |
| Age (y) | LBP | Mean (SD) | 59.7 (12.4) | 54.4 (13.5) | 57.4 (13.6) |
| Knee OA | 64.6 (10.3) | 62.1 (11.5) | 60.2 (13.9) | ||
| Sex (female) | LBP | n (%) | 11 (48) | 37 (66) | 46 (57) |
| Knee OA | 13 (65) | 26 (67) | 35 (62) | ||
| Pain duration (y) | LBP Knee OA |
Mean (SD) | 17.7 (15.2) 9.7 (8.9) |
11.0 (9.8) 9.6 (11.5) |
18.5 (15.7) 6.7 (8.5) |
| Country of origin (Australia) | LBP | n (%) | 20 (87) | 49 (88) | 68 (85) |
| Knee OA | 18 (90) | 36 (92) | 51 (85) | ||
| Education (high school or below) | LBP | n (%) | 16 (70) | 36 (64) | 49 (61) |
| Knee OA | 17 (85) | 31 (79) | 43 (72) | ||
| Employed | LBP | n (%) | 5 (22) | 11 (20) | 17 (21) |
| Knee OA | 3 (15) | 9 (23) | 14 (23) | ||
| Private health insurance (none) | LBP Knee OA |
n (%) | 21 (91) 19 (95) |
52 (93) 39 (100) |
71 (89) 55 (92) |
| Pain intensity (0-10) | LBP | Mean (SD) | 6.7 (1.4) | 6.7 (2.0) | 6.8 (1.6) |
| Knee OA | 7.2 (2.2) | 6.7 (1.6) | 6.8 (2.0) | ||
| Disability* | LBP Knee OA |
Mean (SD) | 16 (3.7) 48.0 (19.8) |
14.1 (5.7) 47.9 (16.4) |
15.8 (5.1) 48.6 (16.5) |
| Weight (kg) | LBP Knee OA |
Mean (SD) | 97.7 (17.5) 97.3 (13) |
89.5 (15.6) 91.3 (12.5) |
90.8 (14.6) 89.5 (13.5) |
| BMI (kg/m2) | LBP | Mean (SD) | 32.9 (3.8) | 32.2 (3.4) | 32.1 (3.6) |
| Knee OA | 34.5 (3.5) | 32.8 (3.3) | 32.1 (3.1) | ||
| Physical activity (mins of MVPA/wk) | LBP Knee OA |
Mean (SD) | 162 (352.5) 19.0 (37.4) |
37.7 (117.9) 163.7 (436.9) |
146.7 (504.0) 100.5 (235.0) |
| Smoker (yes) | LBP | n (%) | 1 (4) | 16 (29) | 21 (26) |
| Knee OA | 2 (10) | 5 (13) | 8 (13) | ||
| Alcohol risk score† | LBP | Mean (SD) | 2 (2.0) | 2 (3.0) | 2.2 (2.6) |
| Knee OA | 4 (4.0) | 3 (3.0) | 3 (2.8) |
The control group data are presented as a reference only.
Disability was measured using the Roland Morris Disability Questionnaire for those with LBP (0-24) and Western Ontario and McMaster Universities Osteoarthritis Index for knee osteoarthritis (0-96).
Assessed through Alcohol Use Disorders Identification Test (AUDIT C).
BMI, body mass index; Compliers, 6 or more completed calls for knee OA plus the consultation for the low back pain group; Noncompliers, <6 calls for knee OA, +/− the consultation for the low back pain group alone; LBP, participants with low back pain; kOA, participants with knee OA; MVPA, minutes of moderate-to-vigorous physical activity.