Development and calibration of a novel positive mindset item bank to measure health-related quality of life (HRQoL) in Singapore

PloS One
Yu Heng KwanJulian Thumboo

Abstract

Positive mindset (PM) is an important domain of health-related quality of life in Singapore, a multi-ethnic urban city state in Southeast Asia. We therefore developed and calibrated a novel item bank to measure and improve PM. We developed an initial candidate pool of 48 items from focus groups, in-depth interviews and existing instruments locally developed and validated for use in Singapore. We administered all items in English to a multi-stage sample stratified for age and gender, of subjects with and without medical conditions recruited from the community and a hospital, and calibrated their responses using Samejima's Graded Response Model. We evaluated a final 36-item bank with respect to Item Response Theory (IRT) model assumptions, model fit, differential item functioning (DIF), concurrent and known-groups validity. Among 493 participants (49.3% male, 41.6% above 50 years old, 33% Chinese, Malay and Indian), bifactor model analyses supported unidimensionality: explained common variance of the general factor was 0.86 and omega hierarchical was 0.97. Local independence was deemed acceptable: the average absolute residual correlations were <0.06 and 3.3% of the total item-pair residuals were flagged for local dependence. The...Continue Reading

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Citations

Jan 4, 2020·Health and Quality of Life Outcomes·Elenore Judy B UyJulian Thumboo

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Software Mentioned

Xcalibre
omega Hierachical
OmegaH
Statistics
PROMIS
Mplus
Excel

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