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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: J Pediatr. 2014 Aug 16;165(6):1091–1097.e2. doi: 10.1016/j.jpeds.2014.06.061

Figure 2.

Figure 2

Cumulative frequencies of HFA, FVC, FEV1, and FEV1/FVC Z-Scores in 1994 and 2012. Plots show the proportions of children (Y axis) with Z-scores less than or equal to a given value (X axis). P values are for two-sample Kolmogorov-Smirnov tests for differences between 1994 and 2012 distributions.