Table 2
Descriptive data of patients with recurrent or persistent low back pain from a randomized clinical trial investigating the outcomes of chiropractic maintenance care
| Variable a | Group | All n = 319 (MC, n = 161; Control, n = 158) | Survival analysis, n = 250 (MC, n = 127; Control, n = 123) | Trajectory analysis, n = 254 (MC, n = 145; Control, n = 109) | |
|---|---|---|---|---|---|
| Age at study start, mean (SD) | MC | 43.4 (11.2) | 43.0 (11.3) | 43.5 (11.3) | |
| Control | 43.1 (13.2) | 42.4 (13.3) | 42.6 (13.6) | ||
| Female, % (n) | MC | 63.5 (94) | 64.7 (77) | 37.9 (50) | |
| Control | 60.3 (85) | 57.5 (65) | 37.0 (37) | ||
| Pain intensity, 0–10, mean (SD) | 1st visit | MC | 5.4 (2.1) | 5.2 (2.1) | 5.4 (2.0) |
| Control | 5.4 (2.1) | 5.3 (2.1) | 5.6 (2.1) | ||
| 4th visit | MC | 2.4 (1.8) | 2.3 (1.8) | 2.6 (1.8) | |
| Control | 2.3 (1.7) | 2.2 (1.7) | 2.3 (1.8) | ||
| Study start | MC | 2.1 (1.5) | 1.8 (1.4) | 2.1 (1.5) | |
| Control | 2.2 (1.8) | 2.0 (1.6) | 2.2 (1.7) | ||
| EQ5D score baseline, mean (SD) | MC | 0.68 (0.23) | 0.67 (0.24) | 0.69 (0.21) | |
| Control | 0.70 (0.20) | 0.71 (0.20) | 0.71 (0.19) | ||
| MPI Subgroup, % (n) | AC | MC | 29.8 (48) | 31.0 (40) | 32.0 (46) |
| Control | 28.3 (45) | 32.5 (40) | 23.9 (26) | ||
| ID | MC | 20.5 (33) | 21.3 (27) | 20.0 (29) | |
| Control | 18.2 (29) | 18.7 (23) | 22.0 (24) | ||
| DYS | MC | 30.4 (49) | 29.1 (37) | 32.0 (46) | |
| Control | 30.2 (48) | 29.3 (36) | 34.9 (38) | ||
| Missing | MC | 19.3 (31) | 18.0 (23) | 24 (17) | |
| Control | 23.3 (37) | 19.5 (24) | 21 (19) | ||
| RMDQ Score (study start), mean (SD) | MC | 4.9 (4.0) | 4.4 (3.9) | 4.9 (4.1) | |
| Control | 4.7 (4.1) | 4.3 (4.1) | 4.9 (3.8) | ||