Known risk factors of the developmental dysplasia of the hip predicting more severe clinical presentation and failure of Pavlik harness treatment

Table 1 Risk factor analysis for Ortolani positive DDH

Risk factor (n)		Ortolan +	p value	OR (CI (95%))
Gender	F (684)	294 (43%)	0.072
Gender	M (260)	95 (36,5%)
Breech presentation	Yes (309)	154 (49,8%)	< 0.001	1.692 (1.284–2.229)
Breech presentation	No (627)	232 (37,0%)
Firstborn	Yes (201)	96 (47,8%)	0.490
Firstborn	No (121)	53 (43,8%)
Positive family history	Yes (138)	58 (42%)	0.755
Positive family history	No (449)	182 (40,5%)
Pregnancy duration	Pre-term (37)	8 (21,6%)	0.012	0.376 (0.170–0.833)
Pregnancy duration	Full-term (889)	376 (42,3%)
Birth weight			0.171

Birthweight was evaluated with T-test for comparing means. Mean weight in Ortolani positive children was 3526 g and 3474 g in Ortolani negative children. All the other comparisons are made using cross-tabulations with chi-square statistics

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