TABLE 2 Growth Curve Analyses of International Index of Erectile Functioning Subscales Among Zambian Men Undergoing Voluntary Medical Male Circumcision

Domain	Quadratic Time^a b (SE)	P	Linear Time b (SE)	P	Baseline Mean Estimate^b	6-Month Mean Estimate	12-Month Mean Estimate
Erectile functioning	-.007 (.004)	.08	.068 (.039)	.08
Orgasm functioning	-.007 (.002)	.006	.156 (.044)	<.001	4.12	4.81	4.99
Intercourse satisfaction	.004 (.002)	.09	.003 (.017)	.84
Overall satisfaction	-.002 (.003)	.42	.037 (.013)	.007	7.09	7.31	7.53
Sexual desire	-.004 (.002)	.02	.093 (.028)	.001	6.25	6.67	6.79

Abbreviation: SE, standard error.
↵a All models initially included both quadratic and linear growth curve components (i.e., fixed and random effects for time² and time); if the quadratic component was not significant, the model was refit using only a linear slope.
↵b Means were estimated using the fitted model for domains that significantly changed over time.
Note: Statistically significant parameters are noted in boldface.