TABLE 1

Summary of patient-reported outcome measure (PROM) questionnaires and concepts captured

	Content validity	Psychometric properties	Items	Recall period	Response scale	SoB on exertion	Cough	Fatigue	Physical functioning	ADL	Emotional wellbeing
K-BILD [17, 18]	Input from patients with ILD (including IPF)	Cross-sectional and longitudinal measurement properties established in patients with IPF	15	2 weeks	7-point Likert scale	F: 3 items			INF: 1 item	INF: 1 item
SGRQ-I [18, 19]	Target: IPF Rasch analysis using HRQoL data from RCT	Cross-sectional and/or without longitudinal measurement properties established in patients with IPF	34	Current/3 months/6 months/12 months	3–5-point Likert scale	S: 1 item; INC: 4 items	S: 2 items; INC: 1 item	INC: 1 item	S: 8 items; INC: 1 item; INF: 2 items	INC: 5 items; INF: 3 items
L-IPF [20]	Input from patients with IPF	Cross-sectional measurement properties established patients with IPF	35	24 h (symptoms) 1 week (impacts)	0–4 NRS format	S: 7 items; INC: 1 item; INF: 3 items	F: 3 items; S: 2 items; INF: 1 item	S: 3 items; INF: 1 item	S: 6 items; INF: 1 item	S: 5 items; INF: 2 items
L-PF [16]	Input from patients with PF-ILD	Not available	44	24 h (symptoms) 1 week (impacts)	0–4 NRS format	S: 12 items; F: 1 item; INF: 3 items; INC: 1 item	F: 5 items; S: 2 items; INC: 1 item	S: 3 items; INF: 1 item	S: 8 items INF: 1 item	S: 7 items; INF: 3 items
CASA-Q [21, 22]	Input from patients with chronic bronchitis	Cross-sectional and longitudinal measurement properties established in patients with COPD and chronic bronchitis	20	1 week	5-point Likert scale	F: 2 items	S: 1 item; F: 2 items	F: 1 item	INF: 2 items	INF: 4 items
LCQ [23]	Input from patients with chronic cough	Cross-sectional and longitudinal measurement properties established in patients with chronic cough or COPD	19	2 weeks	7-point Likert scale		S: 1 item; F: 1 item	F: 2 items		INF: 2 items
E-RS (COPD+IPF) [24, 25]	Input from patients with COPD	Cross-sectional and longitudinal measurement properties established in patients with COPD	11	24 h	5-point Likert scale	S: 5 items	F: 1 item	S: 1 item	INF: 1 item	INF: 2 items
E-RS (COPD+IPF) [24, 25]	Input from patients with IPF	Cross-sectional and longitudinal measurement properties established in patients with IPF	11	24 h	5-point Likert scale	S: 5 items	F: 1 item	S: 1 item	INF: 1 item	INF: 2 items
FACIT-Dyspnoea [26]	Input from patients with dyspnoea	Cross-sectional measurement properties established in patients with dyspnoea	Item bank: 33; short form: 10	1 week	4-point Likert scale	S: 34 items			INF: 12 items	INF: 18 items
FACIT-Fatigue [27]	Input from patients with anaemic cancer	Cross-sectional measurement properties established in a mixed cancer patient population	40	1 week	5-point Likert scale			S: 7 items INF: 1 item	INF: 3 items S: 2 items	INF: 1 item

SoB: shortness of breath; ADL: activity of daily living; K-BILD: King’s Brief Interstitial Lung Disease; SGRQ-I: idiopathic pulmonary fibrosis (IPF)-specific version of St George's Respiratory Questionnaire; L-IPF: Living with Idiopathic Pulmonary Fibrosis; L-PF: Living with Pulmonary Fibrosis; CASA-Q: Cough and Sputum Assessment Questionnaire; LCQ: Leicester Cough Questionnaire; E-RS: Evaluating Respiratory Symptoms; FACIT: Functional Assessment of Chronic Illness Therapy; ILD: interstitial lung disease; F: frequency; INF: interference; HRQoL: health-related quality of life; RCT: randomised controlled trial; PF-ILD: progressive fibrosing interstitial lung disease; S: severity; INC: incidence; NRS: numeric rating scale.