Table 1:

Baseline Clinical and Imaging Characteristics

Note.—Unless otherwise specified, data are numbers of patients, with percentages in parentheses. Percentages may not add up to 100% because of rounding. P values for comparison between individuals with and those without interstitial features were based on the t test for continuous variables and the Fisher exact test for categoric variables. DLCO = diffusing capacity of lung for carbon monoxide, FEV₁ = forced expiratory volume in 1 second, FVC = forced vital capacity, SGRQ = St George’s Respiratory Questionnaire, 6MWD = 6-minute walk distance, RVLV = right ventricular to left ventricular.

*Data in parentheses are mean lengths of follow-up in months.

^†Data are means ± standard deviations.