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.
In 2009, 69 percent of the 74.1 million children under 18 lived with two parents. Four percent (2.9 million) of all children lived with both a mother and father who were not married to each other. Between 1991 and 2009, children living with only their mother increased from 21 percent to 24 percent. The percentage of children living with their mother without a father present varied widely among race and origin groups in 2009, from 8 percent for Asian children to 50 percent for black children. Seventeen percent of non-Hispanic white children and 26 percent of Hispanic children also lived with their mother only.