Fig. 3
From: Efficacy and safety profile of doxofylline compared to theophylline in asthma: a meta-analysis
Forest plot of pair-wise meta-analysis concerning the impact of doxofylline vs. theophylline on the change in FEV1 (a) and salbutamol use as recue medication (d), with relative publication bias assessment via funnel plots (b and e) and Egger’s test (c and f). FEV1: forced expiratory volume in 1 s; SND: standard normal deviate