Table 3.

Multiple variable linear regression models to predict anal pressure during evacuation using anal pressures during squeeze and a Valsalva maneuver

Group	Predictor variables				Model P value	Variance (%) explained by model
	Anal pressure during squeeze		Anal pressure during Valsalva maneuver
	Estimate (95% CI)	P value	Estimate (95% CI)	P value
Healthy women (Model 1)	0.14 (0.02, 0.3)	0.02	0.07 (−0.1, 0.3)	0.5	0.03	8%
Constipated women - normal BET (Model 2)	0.05 (−0.04, 0.1)	0.29	0.27 (0.1, 0.4)	<0.001	<0.001	26%
Constipated women - abnormal BET (Model 3)	0.08 (−0.09, 0.2)	0.35	0.58 (0.3, 0.8)	<0.001	<0.001	49%

BET – Balloon expulsion time; CI – confidence interval