Associations between sex hormones, sleep problems and depression 233 Figure 8.2. Visualization of study setups and samples. – Mean sample sizes (A) and age ranges (B) of included studies, sorted alphabetically by name of first author. (A): red circle displays an observational study, blue triangle represents an intervention study. (B): Black squares display lowest and upper age, diamond shape displays mean age; dashed lines display studies that only included women, solid line represents studies that included both men and women. Shechter et al. (2012) did not report an age range, Toffol et al. (2019) did not report mean age or age ranges, De Zambotti et al. (2015) reported a mean age that was higher than the age range. 3.7. Link sex hormones and sleep Kravitz et al. (2005) and Shechter et al. (2012) found that subjective sleep quality is worse during the luteal phase (when progesterone levels are highest) than during the follicular phase. Li et al. (2015) found that higher
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