Table 3. Follow-up assessment at 3 months.
| Whole sample N = 2337 | Intervention group N = 1135 | Control group N = 1202 | Percentage or mean difference (95% CI) | P value* (Chi-square or t-test) | P value** (adjusted for cluster effect) | |
| Persistent back pain | 289 (12.4%) | 119 (10.5%) | 170 (14.1%) | −3.6 (−6.3; −1.0) | 0.0072 | 0.0131 |
| Visit to spine specialist | 680 (29.4%) | 305 (27.2%) | 375 (31.5%) | −4.3 (−8.0 ; −0.5) | 0.0253 | 0.0566 |
| Spine imaging | ||||||
| Plain radiography | 676 (29.2%) | 327 (29.1%) | 349 (29.2%) | −0.1 (−3.8 ; 3.6) | 0.9428 | 0.8099 |
| Computed tomography | 194 (8.4%) | 89 (7.9%) | 105 (8.8%) | −0.9 (−3.1 ; 1.4) | 0.4469 | 0.4379 |
| Magnetic resonance imaging | 45 (1.9%) | 24 (2.1%) | 21 (1.8%) | 0.3 (−0.7 ; 1.5) | 0.5114 | 0.6886 |
| Sick leave | ||||||
| Yes | 1037 (44.9%) | 503 (45.0%) | 534 (44.8%) | 0.2 (−4.9 ; 4.3) | 0.9250 | 0.9132 |
| Sick leave duration (m±SD) | 6.5±14.4 | 6.0±12.9 | 6.9±15.7 | −0.9 (−2.0 ; 0.4) | 0.1592 | 0.2847 |
| Analgesic intake | 1964 (84.0%) | 936 (82.5%) | 1028 (85.5%) | −3.0 (−6.0 ; −0.1) | 0.0437 | |
| NSAID intake | 1008 (43.1%) | 447 (39.4%) | 561 (46.7%) | −7.3 (−11.3 ; −3.3) | 0.0004 | 0.0103 |
| Muscle-relaxant intake | 864 (37.0%) | 374 (32.9%) | 490 (40.8%) | −7.9 (−11.7 ; −3.9) | <0.0001 | 0.0176 |
| Information about Physical activities | 0.0003 | 0.0020 | ||||
| Very satisfied | 1699 (73.7%) | 868 (77.4%) | 831 (70.3%) | 7.1 (3.5 ; 10.7) | ||
| Rather satisfied | 437 (19.0%) | 194 (17.3%) | 243 (20.5%) | −3.6 (−6.4 ; −0.1) | ||
| Rather unsatisfied | 152 (6.6%) | 55 (4.9%) | 97 (8.2%) | −3.2 (−5.3 ; −1.3) | ||
| Unsatisfied | 17 (0.7%) | 5 (0.4%) | 12 (1.0%) | −0.6 (−1.3 ; 0.1) | ||
| When to consult a physician | 0.0010 | 0.0052 | ||||
| Very satisfied | 1428 (62.0%) | 739 (66.0%) | 689 (58.2%) | 7.8 (3.8 ; 11.8) | ||
| Rather satisfied | 632 (27.5%) | 281 (25.1%) | 351 (29.7%) | −4.6 (−8.2 ; −1.0) | ||
| Rather unsatisfied | 215 (9.3%) | 86 (7.7%) | 129 (10.9%) | −3.2 (−5.6 ; −0.8) | ||
| Unsatisfied | 27 (1.2%) | 13 (1.3%) | 14 (1.2%) | 0.1 (−0.9 ; 0.9 ) | ||
| How to prevent a new episode of back pain | 0.0033 | 0.0243 | ||||
| Very satisfied | 1290 (56.0%) | 660 (58.8%) | 630 (53.3%) | 5.5 (1.5 ; 9.6) | ||
| Rather satisfied | 750 (32.6%) | 359 (32.0%) | 391 (33.1%) | −1.1 (−4.9 ; 2.7) | ||
| Rather unsatisfied | 245 (10.6%) | 97 (8.7%) | 148 (12.5%) | −3.8 (−6.4 ; −1.4) | ||
| Unsatisfied | 19 (0.8%) | 6 (0.5%) | 13 (1.1%) | −0.6 (−1.3 ; 0.2) | ||
| Medication intake | 0.7090 | 0.9901 | ||||
| Very satisfied | 1531 (66.4%) | 743 (66.3%) | 788 (66.6%) | −0.3 (−4.2 ; 3.5) | ||
| Rather satisfied | 622 (27.0%) | 309 (27.5%) | 313 (26.5%) | 1.0 (−2.5 ; 4.7) | ||
| Rather unsatisfied | 142 (6.2%) | 66 (5.9%) | 76 (6.4%) | −0.5 (−2.5 ; 1.4) | ||
| Unsatisfied | 9 (0.4%) | 3 (0.3%) | 6 (0.5%) | −0.2 (−0.8 ; 0.3) | ||
Values are numbers (%); NSAID = nonsteroidal anti-inflammatory drug
*
P value when computing absolute difference
**
P value when taking into account the cluster effect