Quality of life in Indian patients with functional dyspepsia: Translation and validation of the Hindi version of Short-Form Nepean Dyspepsia Index.

Background/purpose: Patients with functional dyspepsia (FD) have poor health-related quality of life (HRQOL), but Indian data are  lacking. Also, there is non-availability of validated disease-specific questionnaire to assess HRQOL in Hindi-speaking patients with dyspepsia. We aimed to develop and validate a reliable translation of Short-Form Nepean Dyspepsia Index (SF-NDI) in Hindi, and assess the impact of FD on HRQOL in Indian patients.

Methods: Cross-cultural adaptation of English version of SF-NDI, translation to Hindi, and adaptation of Hindi version were performed using standard procedures. English and Hindi versions were assessed against Short Form-36 (SF-36), examining for internal consistency, test-retest reliability, and validity.

Results: Total 211 FD patients (144 Hindi speaking, 67 English speaking) were enrolled (mean age 40.8 ± 11.7 years; male:female = 115:96). Median total SF-NDI scores for both languages were 38.75 and 40.0, respectively. Test-retest reliability intraclass correlation coefficients were 0.85 (Hindi) and 0.89 (English). Internal consistency evaluation revealed Cronbach's α coefficient of 0.79-0.86 (Hindi) and 0.78-0.89 (English). SF-NDI sub-scales showed moderate to good correlation with various domains of SF-36 (content validity). There was significant (p < 0.001) decline of HRQOL in patients with severe dyspepsia relative to those with mild dyspepsia (construct validity). On multivariate analysis, factors independently associated with HRQOL were duration of symptoms and dyspepsia severity.

Conclusion: Both English and Hindi versions of SF-NDI are reliable and valid for HRQOL assessment in Indian FD patients, and will be useful in future epidemiological and clinical studies. Indian FD patients have poor HRQOL, being worse in those with severe dyspepsia and longer duration of symptoms.