ArticlePatient related outcome measures2025
Psychometric Evaluation of the Hypoparathyroidism Symptom Diary: Data from a Prospective Phase 3b/4 Study.
Article in Patient related outcome measures, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT03324880 (A Randomized, Double-blind, Placebo-controlled, Adaptive Study to Evaluate Symptom Improvement and Metabolic Control Among Adult Subjects With Symptomatic Hypoparathyroidism Treated With Recombinant Human Parathyroid Hormone [rhPTH), which is not on this map. Not yet cited in PubMed.
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A Randomized, Double-blind, Placebo-controlled, Adaptive Study to Evaluate Symptom Improvement and Metabolic Control Among Adult Subjects With Symptomatic Hypoparathyroidism Treated With Recombinant Human Parathyroid Hormone [rhPTH(1-84)]
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Abstract
Purpose: To assess the psychometric properties of the disease-specific Hypoparathyroidism Symptom Diary (HypoPT-SD) patient-reported outcome (PRO) tool, which consists of a 7-item symptom subscale, a 4-item impact subscale, a single item for anxiety, and a single item for sadness or depression, using data from the BALANCE randomized, placebo-controlled Phase 3b/4 study (NCT03324880). Methods: Eligible patients had symptomatic hypoparathyroidism (HypoPT) at baseline and were aged 18-85 years (inclusive). Patients received recombinant human parathyroid hormone (1-84) or placebo. The HypoPT-SD was filled in daily; data recorded at baseline and Weeks 4, 12, and 26 (end of treatment [EOT]) were included in this analysis. Inter-item and item-total correlations were used to assess HypoPT-SD structure; Cronbach's coefficient α was used to analyze the internal consistency and reliability, and intraclass correlations were used to measure test-retest reliability. Construct validity was determined using correlational analyses between HypoPT-SD scores and scores from other conceptually similar PRO tools. Ability to detect change was assessed and thresholds for meaningful within-patient change were established. Results: The psychometric analysis population (N=93) was predominantly female (88.2%) and white (96.8%), with a mean age of 48.5 years. Inter-item correlations ranged from 0.35 to 0.85 at baseline and from 0.49 to 0.93 at EOT. Item-total correlations ranged from 0.57 to 0.83 at baseline and from 0.69 to 0.88 at EOT. Cronbach's α values at baseline were 0.90 (symptom subscale) and 0.88 (impact subscale). Intraclass correlation coefficients for both subscales in stable patients exceeded 0.70. Significant cross-sectional correlations were observed with most of the conceptually linked PRO tools analyzed, and HypoPT-SD scores were responsive to change. Potential changes of 1.5 (symptom subscale) and 0.8 (impact subscale) were determined as meaningful change thresholds for within-patient improvements. Conclusion: The HypoPT-SD is a reliable measure of key symptoms and impacts of HypoPT.
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