Validation of a derived version of the IPF-specific Saint George’s Respiratory Questionnaire

Respiratory Research

Table 3 Concurrent validity of SGRQ-I_der

	SGRQ-I_der total	SGRQ-I_der symptoms	SGRQ-I_der activities	SGRQ-I_der impacts
K-BILD total	− 0.76	− 0.57	− 0.71	− 0.70
K-BILD chest symptoms	− 0.68	− 0.58	− 0.54	− 0.67
K-BILD breathlessness and activities	− 0.78	− 0.58	− 0.76	− 0.70
K-BILD psychological	− 0.58	− 0.44	− 0.52	− 0.55
SOBQ total	0.80	0.52	0.73	0.77
SF-36 PCS	− 0.71	− 0.50	− 0.63	− 0.69
SF-36 MCS	− 0.46	− 0.40	− 0.34	− 0.46
FVC % predicted	− 0.29	− 0.23	− 0.20	− 0.30
DLCO % predicted	− 0.49	− 0.31	− 0.53	− 0.43
6MWD (m)	− 0.51	− 0.26	− 0.47	− 0.51

Data are presented as Pearson’s correlation coefficients for all patients
SGRQ-I_der: IPF-specific version of the St. George’s Respiratory Questionnaire derived from results from the original St. George’s Respiratory Questionnaire; SGRQ-I: IPF-specific version of the St. George’s Respiratory Questionnaire; K-BILD: King’s Brief Interstitial Lung Disease questionnaire; SOBQ: University of California, San Diego Shortness of Breath Questionnaire; SF-36: Short Form-36; PCS: Physical Component Score; MCS: Mental Component Score; FVC: Forced vital capacity; DLCO: Diffusing capacity of the lung for carbon monoxide; 6MWD: Distance walked during the 6-min walk test

ISSN: 1465-993X