Figure 2.

Relative FVC decline according to GAP stage. The percent-predicted FVC trajectory is assessed by using the mixed models method with splines at yearly intervals. The relative decline from baseline at years 1 and 2 is shown with patients stratified according to baseline GAP stage. The point estimates for relative decline from baseline at years 1 and 2 for each GAP stage group are shown in Figure 2 Table. Although patients with GAP stage 2 declined significantly more compared with patients with GAP stage 1 during year 1 (P = .04), no significant difference was seen between groups by year 2 (P ≥ .31). See Figure 1 legend for expansion of abbreviation.