“The validation of a multidimensional tool to test knowledge, barriers, and the challenges in screening for Tuberculosis among patients with Diabetes Mellitus”

Abstract

Background

The National Coordination Committee (NCC) for the National Tuberculosis Elimination Programme (NTEP) has mandated bi-directional screening for Tuberculosis(TB) and Diabetes Mellitus(DM). The study aims to validate a multidimensional tool to assess the correct knowledge of TB and the barriers and facilitators to TB screening in DM patients.

Aim/objectives

To develop and validate a tool for assessing knowledge, barriers, and challenges in TB screening among DM patients by figuring out the Content Validity Ratios and Indices.

Methods and materials

A multidimensional scale using deductive methods was designed. Between January 2023 and March 2023, ten subject matter experts were contacted in person or by email to validate the tool. Item Impact Score (IIS, Face Validity), Lawshe's Content Validity Ratio (CVR), and Scale Content Validity Indices (CVI) for relevance were computed. For the final tool, only the items with Item Impact Scores of ≥1.5, CVRs of ≥0.62, and CVIs of ≥0.62 (p-value <0.05) were taken into consideration.

Results

The Item Impact Score (Face Validity) of all the items accepted as knowledge, barriers, and challenges for TB among DM patients was ≥1.5. Content Validity Ratios (CVR) for the usefulness of all items related to knowledge, barriers, and challenges for TB was ≥0.62. The Scale Content Validity Indices (for relevance), i.e., S-CVI (Average) and S-CVI (Proportional relevance), were ≥0.62 and all the items were accepted.

Conclusions

The score for Item Impact (IIS), Ratios for Content Validity (CVR), and Indices measuring the content validity of a scale (CVI) in all domains of the final tool were accepted, which contained 38 items.