Figure 2From: Tolerance and rebound with zafirlukast in patients with persistent asthmaEffects of zafirlukast on morning PEF in asthmatic subjects maintained on β2-agonists alone. Solid line represents zafirlukast and dashed line, placebo. Only data from subjects completing the entire study are illustrated. *p = 0.01 compared to placebo, **p < 0.001 compared to before withdrawal.Back to article page