Table 2.

The pre- and postoperative SF12 physical and mental scores in four groups

	SF12 physical score		SF12 mental score
	Preoperative	Postoperative	Preoperative	Postoperative
Group 1 (plate + autograft)	10 (8–14)	16 (14–20), P < 0.003	15 (13–16)	24 (21–27), P = 0.002
Group 2 (cage + plate + bone graft)	12 (10–15)	18 (17–20), P < 0.005	13 (11–15)	25 (23–27), P < 0.001
Group 3 (cage)	8 (6–10)	14.5 (11–20), P < 0.003	14 (12–15)	23 (21–26), P < 0.003
Group 4 (disc arthroplasty)	10 (7–12)	16 (15–20), P < 0.002	15 (12–17)	24 (22–26), P < 0.002