TABLE 3.

Logistic regression analysis of the effect on the recovery rate of BALF for each parameter (n = 535)

Variables		Univariate logistic regression			Multivariate logistic regression
		OR (95%CI)		p‐value	OR (95%CI)		p‐value
Sex	Male	0.37	0.25–0.54	<0.001	0.32	0.20–0.53	<0.001
	Female	REF			REF
Age	≥65 years	0.48	0.33–0.70	<0.001	0.50	0.33–0.76	<0.001
	<65 years	REF			REF
Smoking status	Ex/current smoker	0.64	0.45–0.93	0.018	1.25	0.77–2.02	0.360
	Non‐smoker	REF
Disease	CFIP without AE	0.40	0.24–0.64	<0.001	0.71	0.41–1.26	0.246
	AE of CFIP/ARDS	0.34	0.11–1.09	0.070	0.65	0.18–2.32	0.510
	Others	0.38	0.23–0.63	<0.001	0.68	0.39–1.20	0.184
	Sarcoidosis	REF			REF
Bronchus laterality	Left	0.47	0.32–0.69	<0.001	0.46	0.30–0.71	<0.001
	Right	REF			REF
Bronchus location	Others	0.47	0.31–0.71	<0.001	0.41	0.25–0.65	<0.001
	Middle/lingula	REF			REF
%VC	<65%	0.62	0.42–0.93	0.021	0.63	0.40–1.00	0.050
	≥65%	REF			REF
FEV1/FVC	<80%	0.59	0.41–0.84	0.003	0.42	0.28–0.63	<0.001
	≥80%	REF			REF

Note: The C‐statistic showed good discrimination in the multivariate logistic model (C = 0.73, 95% CI: 0.69–0.78).

Abbreviations: AE, acute exacerbation; ARDS, acute respiratory distress syndrome; BALF, bronchoalveolar lavage fluid; CFIP, chronic fibrotic interstitial pneumonia; CI, confidence interval; FEV₁/FVC, forced expiratory volume in 1 s divided by forced vital capacity; VC, vital capacity.