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 1970, 85 percent of children were living with two parents and 11 percent with their mother only, proportions that shifted to a little more than 70 percent and slightly more than 20 percent, respectively, in 1990.till, more than 1 in 4 children were living with only one parent. The proportion who lived with two parents varied widely by race and ethnicity  87 percent of Asians, 78 percent of non-Hispanic whites, 68 percent of Hispanics and 38 percent of blacks.