The cause of around 10% of fertility problems is unknown. Social, biological, and environmental factors, including contaminants such as , contribute to population fertility in complex ways. Understanding the geographic distribution and trends in fertility will provide basic descriptive clues to changes that may be influenced by environmental risk factors.
The (TFR) provides a nationally consistent measure of general fertility/infertility. The TFR is the number of births that a hypothetical group of 1,000 women would have throughout their childbearing years. This indicator uses age-specific birth rates, which controls for variation in birth rates due to age differences of all women between states and counties. This indicator provides background information about how fertility varies geographically and over time.
- The Total Fertility Rate is the projected average number of births to a hypothetical cohort of 1,000 women throughout their lives by applying the age-specific birth rates observed in the selected year.
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