In women, progesterone levels are relatively low during the preovulatory phase of the menstrual cycle, rise after ovulation, and are elevated during the luteal phase, as shown in diagram below. Progesterone levels tend to be < 2 ng/ml prior to ovulation, and > 5 ng/ml after ovulation.
Results for this Gallup poll are based on telephone interviews conducted Aug. 7-Dec. 29, 2013, on the Gallup Daily tracking survey, with a random sample of 3,445 adults, aged 18-34, living in all 50 U.S. states and the District of Columbia, who report they are currently living at home with their parents.
Not all of Canada's young adults aged 20 to 29 lived in the parental home or in couples. Some men and women in their twenties lived in other arrangements. About 3.2% of young adults aged 20 to 29 were lone parents in 2011 (5.6% of women and 0.8% of men). This share has been less than 4% for the past 30 years.