Abstract
PurposeTo assess the psychometric properties of the Dutch-Flemish Patient-Reported Outcome Measurement Information System Scale v1.2 – Global Health (PROMIS-GH).MethodsThe PROMIS-GH (also referred to as PROMIS-10) was administered to 4370 persons from the Dutch general population. Unidimensionality (CFI ≥ 0.95; TLI ≥ 0.95; RMSEA ≤ 0.06; SRMR ≤ 0.08), local independence (residual correlations < 0.20), monotonicity (H > 0.30), model fit with the Graded Response Model (GRM, p < 0.001), internal consistency (alpha > 0.75), precision (total score information across the latent trait), measurement invariance (no Differential Item Functioning [DIF]), and cross-cultural validity (no DIF for language, Dutch vs. United States English) of its subscales, composed of four items each, Global Mental Health (GMH) and Global Physical Health (GPH), were assessed.ResultsConfirmatory factor analyses, on both subscales, revealed slight departures from unidimensionality for GMH (CFI = 0.98; TLI = 0.95, RMSEA = 0.22; SRMR = 0.04) and GPH (CFI = 0.99; TLI = 0.97; RMSEA = 0.12; SRMR = 0.03). Local independence, monotonicity, GRM model fit, internal consistency, precision and cross-cultural validity were supported. However, Global10 (emotional problems) showed misfit on the GMH subscale, while Global08 (fatigue) presented DIF for age.ConclusionThe psychometric properties of the PROMIS-GH in the Dutch population were considered acceptable. Sufficient local independence, monotonicity, GRM fit, internal consistency, measurement invariance and cross-cultural validity were found. If future studies find similar results, structural validity of the GMH could be enhanced by improving or replacing Global10 (emotional problems).
Highlights
Health-related quality of life (HRQoL) refers to the ‘‘physical, psychological, and social domains of health, seen as distinct areas that are influenced by a person’sPellicciari et al Health Qual Life Outcomes (2021) 19:226 of the International Consortium of Health Outcomes Measurement (ICHOM) [9]
Participants The PROMIS-GH was completed by 4370 Dutch adults from the general population
The Confirmatory Factor Analysis (CFA) on the entire PROMISGH highlighted some departure from the two-factor structure (Comparative Fit Index [CFI] = 0.95, Tucker Lewis Index [TLI] = 0.92,Root Mean Square Error of Approximation [RMSEA] = 0.16,Standardized Root Mean Square Residual [SRMR] = 0.07)
Summary
Health-related quality of life (HRQoL) refers to the ‘‘physical, psychological, and social domains of health, seen as distinct areas that are influenced by a person’sPellicciari et al Health Qual Life Outcomes (2021) 19:226 of the International Consortium of Health Outcomes Measurement (ICHOM) [9]. Results indicated a 2-factor structure which led to the development of two subscales: Global Mental Health (GMH) and Global Physical Health (GPH). Both subscales demonstrated good internal consistency (α = 0.81 and 0.86 for GPH and GMH, respectively). The PROMIS-GH was recommended by panels of international experts as a brief measure of HRQoL, e.g., for patients with low back pain and stroke [15, 16], and was recently included in the ICHOM overall adult health Standard Set to be measured in all patients with or without any disease [9]
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