Table 4.

 Mental component scores and individual scales from the SF-36v2 questionnaire by trial arm and follow-up period

Outcome	Mean (standard deviation) score, sample size									Regression analysis* (arm difference (95% CI), P)
	Baseline			6 weeks			6 months			6 weeks	6 months
	UC	PD		UC	PD		UC	PD
Mental component score	45.7 (13.3), 743	46.1 (12.6), 1504		48.7 (12.2), 653	48.7 (12), 1332		48.7 (11.8), 629	49 (11.9), 1283		−0.03 (−0.88 to 0.82), 0.94	0.11 (−0.83 to 1.05), 0.82
Physical functioning	39.9 (10.2), 743	39.3 (10.4), 1506		43.0 (10.8), 656	43.0 (10.9), 1338		45.2 (10.8), 632	44.7 (11.2), 1284		0.52 (−0.19 to 1.23), 0.14	0.00 (−0.75 to 0.75), 1.00
Role-physical	37.4 (11.2), 743	36.7 (10.9), 1502		43.2 (11.6), 655	43.0 (11.3), 1336		45.5 (11.5), 630	45.0 (11.5), 1284		0.27 (−0.60 to 1.15), 0.52	−0.08 (−1.00 to 0.84), 0.86
Bodily pain	34.9 (8.2), 743	34.6 (8.2), 1506		41.1 (9.6), 657	40.9 (9.9), 1338		43.2 (10.5), 632	43.1 (10.6), 1284		0.06 (−0.68 to 0.80), 0.89	0.04 (−0.81 to 0.90), 0.93
General health	45.1 (10.5), 743	44.6 (10.7), 1506		45.9 (10.5), 657	45.3 (10.8), 1338		46.1 (10.6), 634	45.7 (11.1), 1284		−0.07 (−0.66 to 0.51), 0.81	−0.14 (−0.79 to 0.51), 0.66
Vitality	43.7 (10.6), 743	43.4 (10.7), 1506		46.3 (10.8), 655	46.3 (10.8), 1334		47.4 (10.5), 632	47.0 (11.1), 1283		0.35 (−0.40 to 1.11), 0.35	−0.23 (−1.05 to 0.60), 0.59
Social functioning	40.4 (12.8), 743	39.8 (12.6), 1504		45.1 (12.2), 657	45.0 (12.4), 1338		46.1 (12.0), 632	46.2 (12.2), 1284		0.25 (−0.69 to 1.18), 0.58	0.34 (−0.61 to 1.30), 0.48
Role-emotional	42.1 (14.6), 743	42.3 (14.3), 1498		46.6 (12.7), 655	46.2 (12.9), 1334		47.1 (12.2), 630	47.1 (12.4), 1283		−0.32 (−1.24 to 0.59), 0.51	−0.06 (−1.07 to 0.95), 0.92
Mental health	45.4 (11.7), 743	45.8 (11.4), 1506		47.9 (11.4), 655	48.2 (11.2), 1334		48.3 (11.44), 632	48.7 (11.3), 1283		0.24 (−0.55 to 1.02), 0.57	0.18 (−0.67 to 1.04), 0.72

UC=usual care; PD=PhysioDirect.

*Adjusting for baseline outcome, age, sex, referral problem, and primary care trust.