Table I.

Mean motor unit parameters (a) and median PFDI QOL scores (b) for nulligravid group vs. primigravida/primipara group. (a) The most global differences in both turns/sec and amplitude were noted between nulligravidas and antepartum primigravidas. After vaginal delivery, number of turns/sec declined further, yielding a further decline in the ratio of turns/amplitude that persisted at 6 months post partum.

(b) Median QOL pelvic floor distress inventory scores indicated more distress in antepartum primigravidas than nulligravidas. Post partum, distress scores improved significantly only in the urinary domain.

(Motor unit parameters shown are mean (SD), QOL scores are median (range). Tests of significance by Wilcoxon rank sum and signed rank respectively.)

	Nulligravidas	Primigravida/Primiparas
a. Motor unit parameter at maximum effort		Antepartum	p Nullipara vs Antepartum	6wks post partum	p Antepartum vs 6 wks post partum	6mos post partum	p Antepartum vs 6 mos post partum	p 6wks vs 6 mos post partum
Turns/second	106.9 (84.8)	46.6 (43.2)	0.004	26.1 (41.5)	0.120	34.4 (51.1)	0.187	0.534
Amplitude (µV)	221.6 (60.7)	191.5 (95.4)	0.003	176.1 (52.3)	0.497	193.1 (62.4)	0.667	0.225
T/A (µV−1)	1.08 (0.57)	0.67 (0.44)	0.005	0.39 (0.31)	0.064	0.41 (0.38)	0.018	0.912
b. QOL scores
UDI	0 (0–21.2)	7.1 (0–89.1)	0.007	0 (0–39.8)	0.006	0 (0–44.6)	0.006	0.124
POPDI	8.3 (0–29.2)	16.1 (0–65.4)	0.021	16.7 (0–52.4)	0.193	8.3 (0–78.6)	0.082	0.478
CRADI	8.3 (0–68.1)	15.4 (0–78.1)	0.135	20.3 (0–139.2)	0.035	17.9 (0–92.9)	0.267	0.338