Figure 3

Correlations between log Der 1 ratio and changes in minimum % PEF value (a) and FeNO level (b) in intervention-group patients before intervention (in 2009) and 1 year later (after intervention), and in the non-intervention group during the same test periods. Each ratio is [log Der 1 level in 2010 / log Der 1 level in 2009]. The change in minimum % PEF was calculated as (2010% PEF–2009% PEF)/2009% PEF × 100(%). Each change in FeNO level was calculated as 2010 FeNO value/2009 FeNO value. Twenty-two of the 25 patients recorded their PEF measurements daily, and 23 of 25 performed FeNO measurements. Correlation coefficients (r values) were obtained by using Spearman’s rank correlation test.