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Adjusted mean serum concentrations of total and free estradiol across the menstrual cycle according to intake of caffeinated soda (n = 467 cycles). The analyses were conducted by using nonlinear mixed models with harmonic terms centered on the day of ovulation. Display set: women with a mean age of 27 y, waist-to-hip ratio of 0.75, perceived stress of 20.2, daily exercise of 14.7 min, and energy intake of 1614 kcal who were consumers of alcohol.
