Figure 3From: Medroxyprogesterone improves nocturnal breathing in postmenopausal women with chronic obstructive pulmonary diseaseChanges of SaO 2 nadir during different sleep stages with MPA and after a 3- and a 6-week follow-up. Changes are absolute percentage values. MPA = medroxyprogesterone acetate, SaO2 = arterial oxygen saturation. The error bars of SaO2 nadir represent interquartile ranges. P-values are corrected with Bonferroni method. ** = p < 0.01.Back to article page