The PGH-7 met all assumptions and displayed good structural and convergent ( r = .69) validity. Efficiency was calculated ((1 − SE( θ) 2)/ n items) to compare how well both measures performed relative to number of items administered. Percentages of participants reliably measured (> 0.90) were assessed using the standard error of measurement (SE( θ) < 0.32).
A strong correlation (> .70) was expected between the PGH-7 and PedsQL, as both instruments measure physical, mental, and social domains of health. Subsequently, a model was fitted to the data to assess item fit and cultural differential item functioning (DIF) between Dutch and US children. The assumptions for fitting an item response theory model were assessed: unidimensionality, local independence, and monotonicity. In total, 1082 children (8–18), representative of the Dutch population, completed the PGH-7 and the Pediatric Quality of Life Inventory (PedsQL™ 4.0), a common legacy instrument used in clinical practice to assess overall health. In this cross-sectional study, we aimed to assess the reliability, validity, and efficiency of the Patient-Reported Outcomes Measurement Information System (PROMIS) Pediatric Global Health scale (PGH-7) to reduce patient burden when assessing overall health in clinical practice.
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