Relationship between Perineal Body Length and Degree of Perineal Tears in Primigravidas Undergoing Vaginal Delivery with Episiotomy

Table 6

Logistic regression analysis using backward method.

Variable	Value B		OR	95% CI
				Lower	Upper
Perineal body length ≤ 3.0 cm	1.660	0.009	5.259	1.5	18.1
Head circumference ≥ 33.5 cm	1.885	0.002	6.589	2.0	21.7
Constant	–2.673