Table 3.

Hospital stay and clinical outcomes between two groups before and after matching.

	Before propensity score matching			After propensity score matching
	T2WIHS (N = 326)	Normal (N = 587)	P	T2WIHS (N = 312)	Normal (N = 312)	P
Hospital stay	9.3 ± 4.0	8.2 ± 3.4	0.001∗∗	9.2 ± 3.9	8.5 ± 3.7	0.003∗∗
Improvement of JOA	(57.5 ± 38.4)%	(70.7 ± 24.2)%	<0.001∗∗∗	(58.5 ± 37.8)%	(67.7 ± 23.4)%	<0.001∗∗∗

All data are shown as the mean ± SD and n (%) in the table. ^∗P < 0.05, ^∗∗P < 0.01, and ^∗∗∗P < 0.001 displayed in the table. T2WIHS: T2-weighted image high signal; JOA: Japanese Orthopaedic Association. Improvement of JOA = ((postoperative JOA score − preoperative JOA score)/(17 − preoperative JOA score))∗100%.