Fig. 2.
Trend in mean FGF from September 15, 2010 to June 14, 2011: A smoothed version of FGF trend is shown in which Loess smoother was used individually for each period. The smoothing parameter α was equal to1.2 except for the intermediate period between baseline and the Intervention-1 period when α was set to 2. The gray circles represent the mean FGF for each case. The times when resident personnel changes occurred during Intervention-2 and Intervention-3 are shown with the help of red arrows. FGF = fresh gas flow.