Demographic data on subjects recruited to measure MMP-8 levels in blood samples.

†Data shown are mean results (with SD in parentheses) in both groups for age, gender, forced vital capacity (FVC), FVC % predicted (% pred), total lung capacity (TLC), TLC % predicted, diffusing capacity of the lung for carbon monoxide (DLCO), DLCO % predicted, and smoking pack years.††N/A: not available.¶MMP-8 levels were measured in plasma samples from 21 of the 25 control subjects, MMP-8 levels were measured in leukocytes isolated from up to 7 of the 25 control subjects, and MMP-8 levels were measured in both plasma and leukocyte samples obtained from 3 of the 25 control subjects.