Secondary outcome measures included the change in SPL from pre-nsRP to the end of DBT ( analysis of covariance adjusting for treatment , country , baseline , age , and nerve-sparing score ) , responses to Sexual Encounter Profile ( SEP ) questions 1-3 ( mixed models for repeated measures adjusting for treatment , country , visit , visit-treatment-interaction , age ) , and Standardized Morning Erection Question ( Cochran-Mantel-Haenszel test adjusted for age and country ) .