Table 3.

Subdimensions of the SF-36 at each follow-up visit

Characteristic,	Baseline,	6-month,	12-month,	p
group	mean (SD)	mean (SD)	mean (SD)	Within	Between	Interaction
				groups	groups
Physical functioning				0.10	0.85	0.46
Intervention	27.5 (2.0)	27.6 (2.1)	27.3 (2.5)
Control	27.2 (3.3)	27.1 (3.0)	26.6 (3.2)
Role-physical				0.53	0.08	0.01
Intervention	4.8 (1.5)	5.8 (2.0)	5.5 (2.0)
Control	5.4 (1.7)	5.1 (1.7)	4.6 (1.2)
Bodily pain				0.04	0.02	0.02
Intervention	10.8 (1.9)	10.7 (1.9)	10.8 (1.9)
Control	11.4 (1.0)	10.7 (1.8)	10.3 (1.9)
General health				< 0.001	0.92	0.28
Intervention	17.1 (2.6)	16.1 (2.5)	15.9 (2.2)
Control	17.0 (2.2)	15.3 (1.3)	15.0 (2.0)
Vitality				< 0.001	< 0.001	< 0.001
Intervention	11.5 (3.5)	13.3 (3.5)	12.7 (3.2)
Control	15.9 (2.1)	11.9 (2.3)	10.8 (2.9)
Social functioning				< 0.001	< 0.001	< 0.001
Intervention	6.5 (2.1)	6.8 (2.3)	6.9 (2.0)
Control	8.6 (1.3)	6.4 (1.5)	5.9 (1.5)
Role-emotional				0.97	0.11	0.01
Intervention	3.6 (1.1)	3.8 (1.3)	4.1 (1.4)
Control	3.9 (1.4)	3.4 (0.9)	3.3 (0.9)
Mental health				< 0.001	< 0.001	< 0.001
Intervention	16.2 (4.3)	18.1 (3.9)	17.3 (4.1)
Control	20.8 (3.2)	19.8 (3.5)	14.8 (3.8)

Intervention group, n = 30; Control group, n = 28. SD, standard deviation.