Estriol Level and Birth Weight. J. Greene and J. Touchstone conducted a study on the relationship between the estriol levels of pregnant women and the birth weights of their children. Their findings, “Urinary Tract Estriol: An Index of Placental Function,”

were published in the American Journal of Obstetrics and Gynecology (Vol. 85(1), pp. 1–9). The data points are provided on the WeissStats site, where estriol levels are in mg/24 hr and birth weights are in hectograms (hg).