Comparison of unblinded and blinded patients at 6 weeks
| Variable | Unblinded | Blinded | Unadjusted P |
|---|---|---|---|
| Mean Roland score | 6.1 (SD = 5.48) | 5.1 (SD = 5.50) | .099 |
| No. with 50% Roland score improvement (%) | 55 (60.4%) | 57 (67.1%) | .397 |
| Mean VPAS for average pain | 3.5 (SD = 2.70) | 2.96 (SD = 2.71) | .179 |
| No. with 50% VPAS improvement (%) | 43 (48.3%) | 44 (53.7%) | .529 |
| Mean no. of sick days | 0.6 (SD = 2.2) | 0.8 (SD = 2.3) | .743 |
| No. with 0 sick days (%) | 12 (14.0%) | 12 (15.0%) | .677 |
| Mean self-efficacy pain | 72.2 (SD = 21.8) | 72.5 (SD = 24.1) | .639 |
| Mean self-efficacy other | 73.6 (SD = 19.2) | 74.8 (SD = 21.3) | .400 |
| Mean FAQ physical activity | 13.8 (SD = 6.4) | 13.4 (SD = 6.3) | .698 |
| Mean FAQ work | 12.1 (SD = 11.3) | 10.8 (SD = 10.6) | .457 |
| Mean SF-36: PF | 69.0 (SD = 22.3) | 76.0 (SD = 24.7) | .010 |
| Mean SF-36: RP | 60.5 (SD = 41.3) | 70.2 (SD = 39.5) | .112 |
| Mean SF-36: BP | 56.5 (SD = 22.7) | 65.0 (SD = 24.4) | .041 |
| Mean SF-36: GH | 77.6 (SD = 19.4) | 80.7 (SD = 15.5) | .360 |
| Mean SF-36: VT | 58.3 (SD = 21.4) | 63.1 (SD = 20.0) | .157 |
| Mean SF-36: SF | 85.3 (SD = 21.7) | 86.0 (SD = 20.6) | .886 |
| Mean SF-36: RE | 77.5 (SD = 36.7) | 84.8 (SD = 29.8) | .246 |
| Mean SF-36: MH | 69.4 (SD = 21.0) | 78.7 (SD = 20.2) | .001 |
Note:—SD indicates standard deviation; VPAS, visual pain analog scale; FAQ, fear avoidance questionnaire; SF, short form; PF, physical functioning; RP, role-physical; BP, bodily pain; GH, general health; VT, vitality; SF, social functioning; RE, role-emotional; MH, mental health.