TABLE III.

Association of Perinatal Risk Factors and Acetabular Index of >20° at ≥3 Years of Age^*

Risk Factor	Odds Ratio (95% Confidence Interval)	P Value
Univariate analyses
Female sex	1.90 (1.31-2.74)	0.001
First-born child	0.65 (0.46-0.93)	0.02
Twin pregnancy	1.18 (0.68-1.83)	0.67
Vaginal delivery	1.27 (0.90-1.81)	0.18
First-degree family history	1.05 (0.57-1.95)	0.87
Breech presentation	1.30 (0.90-1.88)	0.15
Abnormal hip examination	2.30 (1.19-4.43)	0.01
Foot deformity	0.89 (0.31-2.56)	0.82
Birth weight in kg	0.84 (0.63-1.14)	0.26
Multivariate analysis†
Female sex	1.77 (1.21-2.59)	0.003
First-born child	0.67 (0.46-0.96)	0.03
First-degree family history	1.31 (0.81-2.13)	0.26
Breech presentation	1.74 (1.08-2.79)	0.02
Abnormal hip examination	1.38 (0.36-2.97)	0.94
Birth weight in kg	0.85 (0.61-1.17)	0.31
Treatment	1.95 (0.65-5.89)	0.24

^*Among 146 patients with this outcome, 12 (8%) had been treated in early infancy.

^†Adjusted for any treatment received in infancy.