Peyronie Disease Questionnaire (PDQ): Turkish Validation

The Peyronie Disease Questionnaire (PDQ) The PDQ is a 15-item, self-administered, disease-specific, and multidimensional printed format instrument developed to quantify the psychosexual symptoms of PD. The PDQ includes three scales: ;psychological and physical symptoms; (6 items) ;penile pain; (3 items), and ;symptom bother; (4 scored items and 2 yes/no questions). The ;psychological and physical symptom; domain has a 5-level Likert scale ranging from ;none; to ;very severe.; Patients must complete items on the ;penile pain; domain thinking about the last 24 h, and a numeric scale ranging from 0 to 10 was used to evaluate its severity. The;symptom bother; domain has a 5-level Likert scale (not at all bothered; a little bit bothered, ;moderately bothered,very ;and extremely bothered). The sum of all responses is calculated and given separately for each domain, as long as a total PDQ score is not intended. Higher domain scores indicate a greater negative impact, being the score range from 0 to 24 for ;psychological and physical symptom; from 0 to 30 for ;penile pain and from 0 to 16 for ;symptom bother

The PDQ translation procedure followed a structured method to ensure reliability. The translation method included the following steps: 1. Translation of the original questionnaire to Spanish by two independent professional translators. 2. Merging both translated versions by the research team. 3. Back translation of the merged version by two native English professional translators. 4. Review of the different back-translated English versions with the original questionnaire by the research team. 5. Revising the conceptual equivalence with the original, performed by both the translators and the researchers. 6. Testing the translated questionnaire in a pilot group of 30 patients. 7. Results analysis of the pilot test and completion of translation by the research team. 8. Final editions of the questionnaire. 9. Final report of the researchers.

This study included a total of 60 patients with a diagnosis of PD excluding those who had previously received invasive treatment. Males over 18 years of age and patients diagnosed with Peyronie disease who had not undergone surgery were included in the study.

The test-retest reliability of the PDQ-I and the internal consistency of its subscales will be assessed. Intraclass correlation coefficients (ICC) will be calculated to assess the degree of association between the PDQ subscale scores. Paired Student t-tests will be used to assess whether there are statistically significant score changes between T1 and T2. Internal consistency reliability will be assessed by calculating Cronbachs alpha for each of the three PDQ subscales.