Factors Influencing Fertility or Pregnancy Health

Background: The North Carolina Early Pregnancy Study (EPS) was held from 1982 to 1986. Women who were trying to get pregnant took part in the study. They collected urine samples. They kept diaries. They filled out surveys. They answered questions about their partners. They were asked about their drug use. Data about air pollution and other exposures were also collected. A follow-up study was held from 2010 to 2011. Researchers want to use the data and samples to study factors that affect reproductive success. Objective: To examine behavioral and environmental exposures and reproductive health, such as menstrual cycles, conception, pregnancy loss, and pregnancy outcomes. Eligibility: The 221 healthy women age 21-42 who were planning to get pregnant and took part in the 1982-86 North Carolina EPS at the time they stopped using all birth control. A 2010-11 follow-up included 173 of these women. Design: This study uses existing data. No new data will be collected in this study. Stored urine samples may be used. Data from surveys and other sources will be used. All of the women who gave data and samples will be included. Electronic data is held in secure databases. The data is kept on computers that are password protected. Hard-copy data are stored in locked file cabinets. The study will take place at more than one site. Data will be shared with groups outside the NIH.

NCT Number	NCT04595760
Lead Sponsor	National Institute of Environmental Health Sciences (NIEHS)
Conditions	Menstrual Cycles, Conception, Early Pregnancy Loss, Pregnancy Outcomes
Enrollment	231 participants
Start Date	2020-10-19
Primary Completion	2030-12-31 (estimated)
Study Completion	2030-12-31 (estimated)
Updated on ClinicalTrials.gov	2026-07-14