Table 2.

Quantitative parameters assessed during 1^st pregnancy and 27 months after childbirth.

	before 1st pregnancy (n = 49)	Group A (n = 39)	p-value before 1st pregnancy vs. A	Group B (n = 10)	p-value before 1st pregnancy vs. B	p-value A vs. B
LAM contraction (Oxford score 0-5)	2.6 (1.15)	2.97 (1.12)	0.131	2.1 (1.30)	0.232	0.039+
Length of introitus (cm)	2.86 (0.55)	2.83 (0.64)	0.813	2.89 (0.67)	0.878	0.794
Length of perineum (cm)	3.81 (0.87)	2.83 (0.60)	< 0.0001*	2.98 (0.57)	0.006*	0.48
Thickness M.sphincter ani ext. (cm)	0.83 (0.17)	0.78 (0.15)	0.152	0.79 (0.16)	0.496	0.144
Thickness M. sphincter ani int. (cm)	0.19 (0.06)	0.19 (0.08)	1	0.22 (0.07)	0.166	0.285

LAM - Levator ani muscle, * t-test significant with p < .05, during pregnancy vs. 27 months after childbirth (group A: without second delivery/group B: with second delivery), ⁺ t-test significant with p < .05, group A vs. group B