Table 1.

Comparison of study and control groups concerning the presence or absence of risk factors for developmental dysplasia of the hip (OR, odds ratio; CI, confidence interval)

	Study group, n (%)	Control group, n (%)	p-value*/OR/95% CI
Infants without any risk factor	67 (35)	402 (53)
Infants having at least one risk factor	125 (65)	358 (47)	p < 0.001/OR 2.10/95% CI 1.51 to 2.92
Infants having one risk factor	84 (67)	283 (79)
Infants having more than one risk factor	41 (33)	75 (21)	p = 0.008/OR 1.84/95% CI 1.17 to 2.89

^*Test used for p-values: Chi-square test