Table 4:

Chronologic changes of mean JOA score and compression group and high T2 signal intensity

	Preoperative	Postoperative (1 wk)	Recovery Rate	Follow-Up (6 mo)	Recovery Rate
Type 0	13.7 ± 2.75 (n = 4)	16.8 ± 0.35 (n = 3)	83.4 ± 23.5	17 (n = 2)	100
Type I	14.1 ± 3.50 (n = 8)	15.9 ± 2.17 (n = 7)^a	75.5 ± 28.4	17 (n = 4)^b	100
Type II	11.1 ± 3.44 (n = 27)	14.1 ± 2.58 (n = 25)^c	57.5 ± 29.8	14.9 ± 2.16 (n = 21)^d	72.7 ± 31.4
Type III	9.9 ± 3.47 (n = 27)^e	13.2 ± 3.36 (n = 24)^f	50.3 ± 28.6	16.1 ± 1.50 (n = 21)^g	84.3 ± 19.1
Total	11.0 ± 3.6 (n = 66)	14.0 ± 2.9 (n = 59)		15.7 ± 1.9 (n = 48)

ISI(−)	11.9 ± 3.54 (n = 34)	15.2 ± 1.95 (n = 30)^h	66.2 ± 27.6	16.4 ± 0.97 (n = 20)ⁱ	86.6 ± 21.6
ISI(+)	10.2 ± 3.65 (n = 32)	13.1 ± 3.28 (n = 29)^j^,^k	49.2 ± 29.9^l	15.5 ± 1.85 (n = 28)^m	77.6 ± 28.2
Total	11.0 ± 3.6 (n = 66)	14.0 ± 2.9 (n = 59)		15.7 ± 1.9 (n = 48)

Note:—ISI indicates increased signal intensity. Values are expressed as means.
↵a P = .02.
↵b P = < .0001 versus type 1 in the preoperative state.
↵c P = .003.
↵d P = .02 versus type II in the preoperative stage.
↵e P = .007.
↵f P = .0002.
↵g P = .0001 versus type III in the preoperative stage.
↵h P = .0001.
↵i P = .0002 versus ISI(−) group in the preoperative state
↵j P = .009 versus the ISI(−) group in the postoperative stage.
↵k P = .004.
↵l P = .04 versus the ISI(−) group.
↵m P = .0001 versus ISI(+) in the preoperative stage.