Table 2: Change over time in psychological factors between low back pain patient cohorts from baseline to six months.
| Variables | Groups and comparisons | Baseline (n=312) | 3wk FU (n=252) | 6wk FU (n=222) | 12wk FU (n=192) | 6mth FU (n=168) |
|---|---|---|---|---|---|---|
| Psychological factors |
FABQ work activity (mean[+/-SD])
Y-ACC (n=124) N- ACC (n=188) N-ACC-NB (n=146) N-ACC-B (n=42) Y-ACC vs. N-ACC Y-ACC vs. N-ACC-NB Y-ACC vs. N-ACC-B N-ACC-NB vs. N-ACC-B |
15 (11) 12 (10) 11 (9) 15 (12) P = .042 P = .020 P = .989 P = .140 |
15 (25) 10 (9) 9 (8) 16 (9) P = .067 P = .051 P = .997 P = .001 |
13 (10) 9 (9) 8 (7) 15 (12) P = .005 P < .001 P = .876 P = .027 |
10 (9) 10 (9) 8 (8) 17 (11) P = .664 P = .274 P = .041 P = .003 |
9 (9) 9 (9) 7 (8) 15 (11) P = .734 P = .504 P = .171 P = .047 |
|
FABQ physical activity (mean[+/-SD]) Y-ACC (n = 124) N- ACC (n=188) N-ACC-NB (n=146) N-ACC-B (n=42) Y-ACC vs. N-ACC Y-ACC vs. N-ACC-NB Y-ACC vs. N-ACC-B N-ACC-NB vs. N-ACC-B |
14 (6) 14 (6) 13 (6) 15 (6) P = .214 P = .234 P = .963 P = .303 |
13 (6) 13 (6) 12 (6) 16 (6) P = .594 P = .254 P = .039 P = .001 |
13 (10) 9 (9) 8 (7) 15 (12) P = .005 P < .001 P = .876 P = .027 |
11 (7) 11 (7) 10 (6) 17 (6) P = .726 P = .678 P < .001 P < .001 |
12 (6) 11 (7) 10 (6) 15 (6) P = .388 P = .304 P = .274 P = .035 |
|
|
Helplessness (PCS) (mean[+/-SD]) Y-ACC (n=124) N- ACC (n=188) N-ACC-NB (n=146) N-ACC-B (n=42) Y-ACC vs. N-ACC Y-ACC vs. N-ACC-NB Y-ACC vs. N-ACC-B N-ACC-NB vs. N-ACC-B |
6.1 (5.9) 6.4 (5.5) 5.5 (4.9) 9.8 (6.0) P = .566 P = .755 P = .002 P < .001 |
3.7 (3.5) 4.6 (4.5) 3.9 (3.9) 7 (5.2) P = .065 P = .974 P = .002 P = .003 |
3.5 (3.5) 5.0 (5.0) 4.1 (4.3) 8.7 (6.1) P = .012 P = .697 P = .001 P = .003 |
2.7 (4.0) 4.7 (5.0) 4.1 (4.5) 7.5 (5.9) P = .003 P = .127 P = .004 P = .046 |
3.3 (4.0) 4.3 (4.6) 3.8 (4.1) 6.6 (6.2) P = .141 P = .815 P = .143 P = .254 |
Raw data are presented, significant difference is indicated in bold; analysis compares patients over time between ACC claim (Y-ACC) versus no ACC claim (N-ACC); no ACC claim patients are further broken down into no ACC claim and not on a benefit (N-ACC-NB), and no ACC claim and on a benefit (N-ACC-B). Post-hoc group comparisons performed in one-way ANOVA with no equal variances; in-group comparison assumed (Tamhane’s T2), two-sided. FU: Follow-up. FABQ: Fear avoidance beliefs questionnaire. PCS: Pain catastrophising scale.