Table 2.

Associations between YKL-40 and pulmonary inflammation and infection

Variable	YKL-40 in BAL				YKL-40 in serum
	β	SE	r2	p	β	SE	r2	p
BAL macrophages (×103/ml fluid)	0.98	0.20	0.34	<0.001	0.10	0.11	0.02	0.34
BAL neutrophils (×103/ml fluid)	0.58	0.07	0.74	<0.001	−0.003	0.04	0.0002	0.92
NE (ng/ml)	0.45	0.06	0.47	<0.001	−0.02	0.04	0.004	0.61
CXCL8 (pg/ml)	0.49	0.07	0.45	<0.001	−0.03	0.05	0.01	0.55
IL-1β (pg/ml)	0.64	0.06	0.62	<0.001	0.08	0.04	0.04	0.052
IL-6 (pg/ml)	0.40	0.21	0.14	0.060	−0.03	0.08	0.005	0.69
Respiratory symptoms at BAL	0.36	0.40	0.06	0.366	−0.10	0.17	0.005	0.57
Pulmonary infection
• Any	1.30	0.34	0.17	<0.001	0.33	0.19	0.06	0.083
• P. aeruginosa	1.21	0.41	0.20	0.003	0.33	0.15	0.06	0.024