Table 1.

Demographic characteristics, anal manometry, and anal sphincter electromyography (EMG) findings by quantitative analysis in patients and controls

			Comparison Between Controls and Patients
Demographic Features	Controls	Patients	P Value Before Adjusting for Age and BMIa	P Value After Adjusting for Age and BMIb
Age, yr	37.9 ± 4.9	54.0 ± 3.0*	NA	NA
BMI, kg/m2	25.1 ± 1.0	30.7 ± 1.6*	NA	NA
Number of vaginal deliveries	0	2.4 ± 1.3
Anal manometry
Anal resting pressure	92 ± 7	53 ± 6c	<0.001	0.02
Anal squeeze pressure	203 ± 12	108 ± 14c	<0.001	0.006
Anal sphincter EMGd
Rest, no. of motor units	6.8 ± 0.6	5.1 ± 0.4	0.07	0.03
Rest, motor unit duration, ms	5.5 ± 0.4	6.6 ± 0.4	<0.05	0.71
Rest, polyphasic motor units, %	14 ± 2	22 ± 2	0.07	0.52
Squeeze, no. of motor units	4.8 ± 0.3	4.2 ± 0.3	0.28	0.41
Squeeze, motor unit duration, ms	4.6 ± 0.4	6.5 ± 0.5	0.003	0.11
Squeeze, polyphasic motor units, %	9 ± 2	16 ± 3	0.09	0.44

^aRank sum test for association of subject status with specific feature.

^bMultiple variable regression model to assess association of subject status with specific feature adjusting for age and body mass index (BMI).

^*P < 0.05 vs. controls.

^cValues are averaged across all sites and also across multiple maneuvers during squeeze, in each patient.

^dQuantitative analysis.