. Author manuscript; available in PMC: 2009 Mar 30.

Published in final edited form as: Acta Obstet Gynecol Scand. 2004 Oct;83(10):941–945. doi: 10.1111/j.0001-6349.2004.00457.x

Table III.

Risk factors for stress urinary incontinence (SUI) four years after the first delivery. Univariate analysis using the χ² test. Values are percentages (n).

Risk factor	SUI		P
	Yes (n = 89)	No (n = 218)
Age at delivery > 30 yr.	53.9(48)	36.7 (80)	0.005
BMI > 27 kg/m²	2.2 (2)	4.6(10)	0.34
Birth weight ≥ 4000 g	2.2 (2)	1.4(3)	0.58
Labor ≥ 8 h	41.6(37)	21.1 (46)	0.0002
Active 2^nd stage ≥ 20 min	16.9(15)	19.3 (42)	0.62
Cesarean section	6.7 (6)	11.5(25)	0.21
Forceps	38.2 (34)	35.3 (77)	0.63
Third degree tear	2.2 (2)	0.9 (2)	0.35
Leakage before pregnancy	16.1 (14/87)^*	0.9 (2/217)^*	<0.0001
Leakage during pregnancy	40.2 (35/87)^*	15.3 (33/216)^*	<0.0001
Second delivery	69.6 (53)	61.0(133)	0.81

Missing values correspond to questions not completed.