Figure 5From: Effects of sex hormones on bronchial reactivity during the menstrual cycle cAMP levels in induced sputum samples from asthmatic patients. Sputum cAMP levels were significantly higher in the luteal phase when compared with the follicular phase of the menstrual cycle. Data are mean ± SEM (n = 36). Follicular phase vs luteal phase; ***indicates P < 0.001.Back to article page