Table 5.
Sensitivity analyses according to first contacted professional
| First contacted professional | Physician (Intervention n = 84, control n = 51) | Physiotherapist (Intervention n = 67, control n = 114) | ||||
|---|---|---|---|---|---|---|
| Intervention | Control | Intervention | Control | |||
| Imaging (yes/no)a | % (n) | % (n) | OR (95% CI); P value | % (n) | % (n) | OR (95% CI); P value |
| Imaging 3 months | 7.3 (6) | 29.4 (15) | 0.15 (0.09–0.24); < 0.001 | 10.4 (7) | 11.4 (13) | 1.23 (0.30–5.61); 0.729 |
| Imaging 12 months | 15.7 (13) | 42 (21) | 0.23 (0.16–0.33); < 0.001 | 17.9 (12) | 22.3 (25) | 0.91 (0.37–2.25); 0.842 |
| Radiographs 3 months | 6.0 (5) | 19.6 (10) | 0.21 (0.19–0.23); < 0.001 | 4.5 (3) | 6.1 (7) | 0.88 (0.17–4.57); 0.882 |
| Radiographs 12 months | 8.3 (7) | 23.5 (12) | 0.28 (0.25–0.31); < 0.001 | 9.0 (6) | 12.4 (14) | 0.79 (0.31–2.02); 0.616 |
| Magnetic resonance imaging (MRI) 3 months | 3.6 (3) | 13.7 (7) | 0.17 (0.09–0.32); < 0.001 | 8.7 (6) | 5.3 (6) | 1.76 (0.57–5.48); 0.329 |
| MRI 12 months | 9.5 (8) | 23.5 (12) | 0.33 (0.16–0.70); 0.004 | 15.9 (11) | 16.8 (19) | 0.91 (0.48–1.71); 0.760 |
| PROMIS T-scoreb | Mean (SE) | Mean (SE) | Mean difference (CI); P value | Mean (SE) | Mean (SE) | Mean difference (CI); P value |
| Baseline | 42.8 (1.0) | 42.2 (1.2) | 0.60 (-3.9 to 5.1); 0.713 | 45.9 (0.9) | 44.9 (0.8) | 1.1 (-1.4 to 3.5); 0.391 |
| Change 3 m | 3.1 (1.1) | 1.3 (1.2) | 1.87 (-1.4 to 5.1); 0.254 | 2.2 (1.0) | 1.3 (0.8) | 0.9 (-1.7 to 3.6); 0.488 |
| Change 12 m | 2.7 (1.7) | 1.3 (1.8) | 1.44 (-5.0 to 7.9); 0.591 | 1.7 (1.7) | 2.6 (1.3) | -0.9 (-8.7 to 6.8); 0.704 |
| Sick leave daysc | Mean (SD) | Mean (SD) | RR (95% CI); P value | Mean (SD) | Mean (SD) | RR (95% CI); P value |
| 3 months | 4.9 (10.6) | 13.0 (23.2) | 0.35 (0.20–0.64); 0.001 | 1.4 (7.8) | 7.7 (21.6) | 0.24 (0.09–0.71); 0.010 |
| 12 months | 6.9 (16.7) | 16.0 (30.1) | 0.34 (0.23–0.51); < 0.001 | 4.5 (17.9) | 28.6 (78.6) | 0.17 (0.07–0.45); < 0.001 |
| LBP-related health care appointmentsc | ||||||
| Physician 3 months | 1.6 (1.5) | 2.2 (1.4) | 0.65 (0.55–0.75); < 0.001 | 0.3 (0.6) | 0.6 (1.2) | 0.39 (0.18–0.84); 0.017 |
| Physician 12 months | 2.0 (2.2) | 3.0 (2.0) | 0.60 (0.49–0.72); < 0.001 | 0.9 (1.7) | 1.2 (2.3) | 0.72 (0.27–1.89); 0.501 |
| Physiotherapist 3 months | 0.8 (1.3) | 0.6 (0.93) | 0.90 (0.59–1.58); 0.897 | 2.0 (1.2) | 1.6 (0.9) | 1.29 (1.16–1.43); < 0.001 |
| Physiotherapist 12 months | 1.3 (2.6) | 1.2 (1.6) | 0.80 (0.47–1.37); 0.417 | 2.8 (2.1) | 2.4 (2.6) | 1.05 (1.02–1.09); < 0.001 |
| Nurse 3 months | 0.3 (0.8) | 0.1 (0.4) | 1.22 (0.22–6.81); 0.823 | 0.1 (0.3) | 0.1 (0.3) | 1.39 (0.39–4.99); 0.617 |
| Nurse 12 months | 0.8 (1.7) | 0.2 (0.7) | 1.73 (0.39–7.77); 0.474 | 0.3 (1.5) | 0.1 (0.3) | 5.19 (1.16–23.3); 0.031 |
| Secondary health care 3 months | 0.37 (0.92) | 0.39 (0.67) | 0.79 (0.75–0.82); < 0.001 | 0.2 (0.9) | 0.3 (0.6) | 0.86 (0.30–2.50); 0.783 |
| Secondary health care 12 months | 0.57 (1.17) | 0.53 (0.98) | 0.91 (0.88–0.95); < 0.001 | 0.6 (1.4) | 0.8 (2.1) | 0.84 (0.34–2.08); 0.699 |
Presented as intervention group vs control group.aDifference between intervention and control groups analysed with logistic regression using generalized estimating equations with exchangeable working correlation matrix. bLeast square mean difference estimated from linear mixed model with random effects for unit. Positive and negative mean differences indicate higher and lower values among intervention group, respectively. cDifference between intervention and control groups analysed with Poisson regression using general estimating equations with exchangeable working correlation matrix