Table 3.

Two-year change in health-related quality of life, SF-36 components

SF-36 component	Group; mean ± SD Δ quality of life		p value*
	Decompression alone, n = 46	Decompression and fusion, n = 133
Physical component summary	10.43 ± 10.77	11.36 ± 10.21	0.61
Mental component summary	7.36 ± 14.01	4.26 ± 13.35	0.19
Physical functioning	27.34 ± 31.16	30.37 ± 27.06	0.53
Role-physical	32.88 ± 36.41	37.71 ± 38.62	0.46
Bodily pain	32.78 ± 23.57	28.53 ± 27.04	0.35
General health	1.06 ± 22.53	2.01 ± 21.70	0.80
Vitality	14.28 ± 25.34	17.88 ± 25.35	0.41
Social functioning	32.50 ± 32.57	27.18 ± 34.28	0.36
Role-emotional	23.06 ± 48.43	17.99 ± 45.28	0.53
Mental health	12.67 ± 20.06	8.35 ± 19.23	0.20

SD = standard deviation.

^*Two-sample Student t test.