Background
The Hindi translation of the “Vancouver Symptom Score for Dysfunctional Elimination Syndrome” (VSSDES) is the only valid and reliable BBD questionnaire available for use in the Hindi-speaking population. This study aimed to assess the responsiveness and minimum important change (MIC) of the Hindi-VSSDES in children with overactive bladder (OAB).
Methods
This observational study included (between November 2022 and February 2024) toilet-trained children aged 5–16 years with OAB. The participants had to fill out the Hindi-VSSDES and a comparison tool (Thergaonkar scale [TS)) on their first visit and after 12 weeks of treatment. Additionally, they were asked to rate their perceived change in bladder bowel dysfunction by answering an anchor question (Global Rating of Change Scale [GRCS]) in Hindi at 12 weeks. Employing a construct validity approach, five a priori hypotheses concerning correlations, effect sizes, and the area under the ROC curve (AUC) were formulated to assess responsiveness. Responsiveness was deemed confirmed if ≥ 75 % of the hypotheses were fulfilled. The optimal cutoff on the ROC curve was the MIC value. An anchor-based MIC distribution graph was constructed. The methods complied with COSMIN recommendations.
Results
Seventy-five children were screened and 70 (mean age 7.9 ± 2.6 years) completed the 12-week follow-up. The mean total scores of Hindi-VSSDES at baseline (13 ± 6.8), and the 12-week follow-up (6.3 ± 4.4) were significantly different (p < 0.001). We found no evidence of floor or ceiling effects. Four of the five predefined hypotheses were fulfilled, thereby validating the responsiveness. Hindi-VSSDES had a correlation of 0.76 and 0.5 with the TS and GRCS respectively. The AUC of ROC was 0.71 for the “improved” versus “no change” group using the GRCS anchor. The MIC value was 5.5 score points.
Conclusion
The Hindi-VSSDES is a responsive tool and the first Hindi BBD questionnaire with a known MIC value. It can be used in clinical practice and research to evaluate the effectiveness of interventions in OAB.
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