Effectiveness of a two-stage posterior-anterior–posterior surgery using subcutaneously preserved autologous bone grafts for adult spinal deformity: a retrospective observational study

Table 1 Patient demographics

Variable	Two-stage PAP surgery (N = 12)	Single-stage AP surgery (N = 16)	P value*
Age	68.4 ± 4.2	66.4 ± 8.8	0.478
Sex (male/female)	1/11	1/15	0.832
Height (cm)	146.7 ± 6.8	154.6 ± 6.2	0.004
Weight (kg)	47.7 ± 8.4	57.7 ± 9.6	0.008
BMI (kg/m²)	22.0 ± 2.2	24.2 ± 3.7	0.088
ASA-PS			0.315
Class I	2 (17)	1 (7)
Class II	9 (75)	15 (93)
Class III	1 (8)	0 (0)

Data are shown as number (%) or mean ± SD. PAP, posterior-anterior–posterior; AP, anterior–posterior; BMI, body mass index; ASA-PS, American Society of Anesthesiologists physical status. *P values were calculated using the unpaired t-test for means and the Chi-squared test for proportions

ISSN: 1749-799X