Table 2.

Mean value, standard error, and P value for each SF-36 subscale measured at varying time points^a

SF-36	Time (mean ± standard error)
Subscale	Preoperative (n = 335)	Third month (n  =  309)	Sixth month (n = 301)	First year (n = 266)	Second year (n = 206)	Fifth year (n = 182)
PF	39.81 ± 3.94	60.41 ± 1.98**	69.61 ± 1.87**	78.72 ± 1.97**	80.89 ± 2.27	87.85 ± 1.78**
RP	12.17 ± 5.91	39.32 ± 2.87**	48.35 ± 3.06**	64.45 ± 3.18**	78.04 ± 3.24**	90.28 ± 2.47**
BP	42.28 ± 1.29	47.85 ± 0.78**	48.42 ± 0.72*	49.25 ± 0.82*	49.54 ± 0.71	49.84 ± 0.63
GH	52.05 ± 3.17	61.71 ± 1.60**	64.01 ± 1.69	66.79 ± 1.70	69.43 ± 1.81	79.85 ± 1.57**
VT	56.21 ± 3.26	66.88 ± 1.43**	67.68 ± 1.52	70.76 ± 1.49*	71.43 ± 1.83	82.94 ± 1.71**
SF	60.88 ± 3.75	66.61 ± 1.60**	74.89 ± 1.59**	81.51 ± 1.67**	88.70 ± 1.91**	94.99 ± 1.66**
RE	43.64 ± 6.11	77.42 ± 3.29**	85.73 ± 3.40**	88.29 ± 3.32	89.95 ± 3.51	95.10 ± 3.21*
MH	61.95 ± 2.67	71.48 ± 1.21**	72.64 ± 1.24	72.85 ± 1.26	74.44 ± 1.59	83.13 ± 1.62**
PCS	25.76 ± 1.51	30.42 ± 0.75**	33.64 ± 0.75**	37.69 ± 0.77**	39.89 ± 0.84**	43.29 ± 0.63**
MCS	47.71 ± 1.53	54.02 ± 0.76**	55.04 ± 0.79*	55.37 ± 0.77	55.99 ± 0.87	59.93 ± 0.87**

PF physical function, RP role physical, RE role emotional, SF social function, BP bodily pain, VT vitality, MH mental health, GH general health, PCS physical component summary score, MCS mental component summary score

*P < 0.05; **P < 0.01

^aP value denotes significant differences between each time point and baseline