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Table 3 Variables associated with a decline in the z-score for FEF25–75 %

From: Lung function in severe pediatric asthma: a longitudinal study in children and adolescents in Brazil

FEF25–75% (z-score) Slope (95% CI)a p
(Intercept) 1.74 (0.97; 2.50) 0.000
Study follow-up (months) − 0.02 (− 0.02; − 0.01) 0.000
Age at first spirometry − 0.26 (− 0.33; − 0.20) 0.000
FeNO − 0.01 (− 0.01; 0.00) 0.001
  1. aMonthly variation in response