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Table 2: 
Comparison of unblinded and blinded patients at 6 weeks
VariableUnblindedBlindedUnadjusted P
Mean Roland score6.1 (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 pain3.5 (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 days0.6 (SD = 2.2)0.8 (SD = 2.3).743
No. with 0 sick days (%)12 (14.0%)12 (15.0%).677
Mean self-efficacy pain72.2 (SD = 21.8)72.5 (SD = 24.1).639
Mean self-efficacy other73.6 (SD = 19.2)74.8 (SD = 21.3).400
Mean FAQ physical activity13.8 (SD = 6.4)13.4 (SD = 6.3).698
Mean FAQ work12.1 (SD = 11.3)10.8 (SD = 10.6).457
Mean SF-36: PF69.0 (SD = 22.3)76.0 (SD = 24.7).010
Mean SF-36: RP60.5 (SD = 41.3)70.2 (SD = 39.5).112
Mean SF-36: BP56.5 (SD = 22.7)65.0 (SD = 24.4).041
Mean SF-36: GH77.6 (SD = 19.4)80.7 (SD = 15.5).360
Mean SF-36: VT58.3 (SD = 21.4)63.1 (SD = 20.0).157
Mean SF-36: SF85.3 (SD = 21.7)86.0 (SD = 20.6).886
Mean SF-36: RE77.5 (SD = 36.7)84.8 (SD = 29.8).246
Mean SF-36: MH69.4 (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.