Cervical Sagittal Imbalance after Cervical Laminoplasty in Elderly Patients

Table 4

Mann-Whitney test of sagittal alignment parameter changes in patients after laminoplasty.

	Mean rank	Sum of rank	value
C2-7 SVA
Elderly group ()	38.63	1159.00	<0.01
Young age group ()	22.37	671.00
T1 slope
Elderly group ()	31.27	938.00	0.734
Young age group ()	29.73	892.00
CL
Elderly group ()	27.55	826.50	0.191
Young age group ()	33.45	1003.50
T1 slope-CL
Elderly group ()	27.22	816.50	0.145
Young age group ()	33.78	1013.50

C2-7 SVA: C2-7 sagittal vertical axis; CL: cervical lordosis; T1 slope-CL: T1 slope minus cervical lordosis. . , statistically significant.