Table 4.

Bronchoalveolar Lavage Characteristics

	Normal (n = 23)	At-Risk (n = 75)	Idiopathic Pulmonary Fibrosis (n = 12)	P Value
Cells (104)/ml	6.7 (2.3)	8.3 (6.1)	19.8 (23.1)	0.006
Differential
Macrophages	90 (8.0)	91 (7.8)	76 (22.2)	0.002
Lymphocytes	8 (8.0)	7 (6.5)	15 (19.9)	0.116
Neutrophils	2 (1.6)	1 (1.2)	7 (8.5)	0.004
Eosinophils	0 (0.2)	0 (2.5)	3 (2.5)	<0.001

Data expressed as mean (SD). Data were compared by analysis of variance. Pairwise comparison of normal versus at-risk was not significant.