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Quality of Life Research
Published in: Quality of Life Research 12/2016

Open Access 01-12-2016

Psychometric assessment of the IBS-D Daily Symptom Diary and Symptom Event Log

Authors: Kathleen Rosa, Leticia Delgado-Herrera, Bernie Zeiher, Benjamin Banderas, Rob Arbuckle, Glen Spears, Stacie Hudgens

Published in: Quality of Life Research | Issue 12/2016

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Abstract

Purpose

Diarrhea-predominant irritable bowel syndrome (IBS-D) can considerably impact patients’ lives. Patient-reported symptoms are crucial in understanding the diagnosis and progression of IBS-D. This study psychometrically evaluates the newly developed IBS-D Daily Symptom Diary and Symptom Event Log (hereafter, “Event Log”) according to US regulatory recommendations.

Methods

A US-based observational field study was conducted to understand cross-sectional psychometric properties of the IBS-D Daily Symptom Diary and Event Log. Analyses included item descriptive statistics, item-to-item correlations, reliability, and construct validity.

Results

The IBS-D Daily Symptom Diary and Event Log had no items with excessive missing data. With the exception of two items (“frequency of gas” and “accidents”), moderate to high inter-item correlations were observed among all items of the IBS-D Daily Symptom Diary and Event Log (day 1 range 0.67–0.90). Item scores demonstrated reliability, with the exception of the “frequency of gas” and “accidents” items of the Diary and “incomplete evacuation” item of the Event Log. The pattern of correlations of the IBS-D Daily Symptom Diary and Event Log item scores with generic and disease-specific measures was as expected, moderate for similar constructs and low for dissimilar constructs, supporting construct validity. Known-groups methods showed statistically significant differences and monotonic trends in each of the IBS-D Daily Symptom Diary item scores among groups defined by patients’ IBS-D severity ratings (“none”/“mild,” “moderate,” or “severe”/“very severe”), supporting construct validity.

Conclusions

Initial psychometric results support the reliability and validity of the items of the IBS-D Daily Symptom Diary and Event Log.
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Metadata
Title
Psychometric assessment of the IBS-D Daily Symptom Diary and Symptom Event Log
Authors
Kathleen Rosa
Leticia Delgado-Herrera
Bernie Zeiher
Benjamin Banderas
Rob Arbuckle
Glen Spears
Stacie Hudgens
Publication date
01-12-2016
Publisher
Springer International Publishing
Published in
Quality of Life Research / Issue 12/2016
Print ISSN: 0962-9343
Electronic ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-016-1335-1

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