Validation of Short-form Nepean Dyspepsia Index in Iranian Patients with Functional Dyspepsia

Abstract

Background:

Studying the validity and reliability of short-form (SF)-Nepean Dyspepsia Index (NDI) in patients with functional dyspepsia (FD).

Materials and Methods:

After translating to Persian, the NDI-10 was filled out by 210 patients with FD, whose disease had been diagnosed by a gastroenterologist based on Rome 3 criteria, who admitted to Gastroenterology Clinic of Afzalipour Hospital in 2015. The reliability of the questionnaire was studied by test-retest and Cronbach’s alpha coefficient. The validity of the questionnaire was evaluated through content-validity and criterion-validity.

Results:

Through analyzing the results of test-retest of the questionnaire, the Pearson coefficient was obtained as 83%, which proves the reliability of the questionnaire. Criterion-validity with the correlation coefficient of 0.56 and content-validity both prove the adequacy of questionnaire for measuring the quality of life in patients with FD.

Conclusion:

Generally, Persian translation of this questionnaire has acceptable validity and reliability for measuring the quality of life in patients with FD.