Abstract
Background
The Expanded Prostate Index Composite for Clinical Practice (EPIC-CP) is a short version of the original EPIC, developed to facilitate the instrument’s use in routine care. This study aimed to validate the EPIC-CP Portuguese version, and evaluate its role in presenting early functional outcomes of surgically treated prostate cancer patients at a Latin American referral center.
Methods
The EPIC-CP was self-administered prospectively and individually by all localized prostate cancer patients, before and after robotic-assisted radical prostatectomy, from March 2017 to June 2018 at a single institution. For validation, we used the Cronbach’s alpha coefficient to evaluate internal consistency. The EPIC-CP domains were compared before surgery, and 6 months and 12 months after surgery. Statistical analyses were performed using the student’s t test, and Wilcoxon and Friedman tests, with p values < 0.05 considered significant.
Results
One hundred and fifty two patients answered the EPIC-CP. The patients had a median age of 62.7 (± 8.5) years and prostate specific antigen level of 6.3 (± 4.6) ng/ml. The Cronbach’s alpha varied from 0.75 to 0.77 for all domains with good internal consistency, except for the “vitality/hormonal” domain, which had a score of 0.35. The domain evolution for the preoperative and 6-month postoperative groups revealed that the domains related to urinary continence and bowel worsened, and were increased during the first 6 months; however, this variation had no obvious clinical implications, and the irritative symptoms improved. Regarding the sexual domain, the scores worsened, and also increased over the first 6 months. The results of the confirmatory factor analysis were robust, with an explained variance of 0.951 and covariance of 0.929.
Conclusions
The Portuguese version of the EPIC-CP is a reliable and valid questionnaire for postoperative patients, and very useful to improve the knowledge of the early functional outcomes of men treated for prostate cancer.
Psychometric validation of the Brazilian Portuguese version of Bandura’s exercise self-efficacy scale in diabetes patients
