Evaluation of a respiratory symptom diary for clinical studies of idiopathic pulmonary fibrosis.

Abstract:

BACKGROUND:There are no validated patient diaries for evaluating respiratory symptoms in idiopathic pulmonary fibrosis (IPF). PURPOSE:To evaluate the performance properties of the chronic obstructive pulmonary disease (COPD) Evaluating Respiratory Symptoms™ (E-RS™: COPD) measure in patients with IPF. METHODS:Concept elicitation and cognitive interviews were conducted with IPF patients to evaluate content validity, including comprehensiveness, relevance, and interpretability of E-RS™ items in this patient population. Secondary analyses of IPF clinical study data were performed to evaluate the scoring structure of the tool. With modifications, reliability, validity, and responsiveness of the instrument (E-RS™: IPF) were evaluated. RESULTS:Qualitative interviews (n = 30) were conducted. During the elicitation interviews (n = 20), concept saturation for IPF respiratory symptoms was achieved; all respiratory symptoms covered by the E-RS™ were endorsed by ≥ 30% of the sample. During cognitive interviews (n = 10), all participants found the items interpretable and relevant. Factor analyses conducted via secondary analysis of IPF clinical study data identified no total score and four symptom scales: Chest, Breathlessness, Cough, and Sputum. Reliability of each scale was high (internal consistency [α] >0.85); 2-day reproducibility (ICC >0.88). Validity was supported through significant (P < 0.0001) relationships with the St. George's Respiratory Questionnaire (SGRQ), the University of California, San Diego Shortness of Breath Questionnaire (UCSD-SOBQ), and other variables. The scales were responsive to change when evaluated using SGRQ Symptoms, UCSD-SOBQ, and Patient Global Impression of Change as anchors (P < 0.01 to P < 0.0001). CONCLUSION:The E-RS™: IPF is a valid, reliable, and responsive tool for evaluating respiratory symptoms in patients with IPF.

journal_name

Respir Med

journal_title

Respiratory medicine

authors

Bacci ED,O'Quinn S,Leidy NK,Murray L,Vernon M

doi

10.1016/j.rmed.2017.11.011

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

130-138

eissn

0954-6111

issn

1532-3064

pii

S0954-6111(17)30392-X

journal_volume

134

pub_type

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