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. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: Sleep Med. 2014 Mar 6;15(6):688–693. doi: 10.1016/j.sleep.2014.02.003

Figure 1.

Figure 1

A steeper increase in progesterone slope was associated with more wakefulness after sleep onset (1a, p=0.016) and more awakenings per hour of sleep (1b, p=0.08). Dark circles indicate women with an elevated serum progesterone level at the time of PSG and open circles indicate women whose serum progesterone level had not yet risen. WASO% = minutes of wake after sleep onset ÷ sleep period time X 100. n=23 (slope could not be calculated in 4 women because of missing progesterone levels at blood draw 1)