Figure 7From: Effects of sex hormones on bronchial reactivity during the menstrual cycle % PDE activity in induced sputum samples from asthmatic patients. % PDE activity was significantly higher in the follicular phase when compared with levels measured in the luteal phase of the menstrual cycle. Data are mean ± SEM (n = 36). Follicular phase vs luteal phase; ***indicates P < 0.001.Back to article page