“I don’t think anyone should make sweeping value judgments based on a mother’s decision to work or not work,” says Dr. Melinda Morrill, research assistant professor of economics at NC State and author of the study. “But, it is important that we are aware of the costs and benefits associated with a mother’s decision to work.”
The study looked at the health of school-age children who have at least one younger sibling. When a mother works, the study found, it leads to a 200 percent increase in the child’s risk of having each of three different adverse health events: overnight hospitalizations, asthma episodes, and injuries or poisonings.
Previous studies have shown that, on average, children have better health outcomes when the mother works. Those findings have been attributed to factors such as increased income, availability of health insurance and an increase in the mother’s self-esteem.
However, Morrill found that was not the case. Morrill used advanced statistical techniques to focus specifically on the causal relationship between mothers working and children’s health. Morrill’s approach accounts for a number of confounding factors, such as how a child’s health affects the mother’s ability to work. For example, if a child is very sick, the mother may be more likely to stay at home.
“I wanted to look at mothers whose decision to work was not based on their children’s health,” Morrill says, explaining that a woman’s youngest child’s eligibility for kindergarten can influence her ability to return to the workforce. In assessing health outcomes, Morrill looked solely at older children already enrolled in school, between the ages of 7 and 17, whose youngest sibling was around kindergarten age.
The study examined 20 years worth of data covering approximately 89,000 children from the CDC’s National Health Interview Survey. The data were collected between 1985 and 2004.
The paper, “The effects of maternal employment on the health of school-age children,” is forthcoming from the Journal of Health Economics. The research was funded by the Agency for Healthcare Research and Quality, which is within the U.S. Department of Health and Human Services.
NC State’s Department of Economics is part of the university’s Poole College of Management.
Note to Editors: The study abstract follows.
“The effects of maternal employment on the health of school-age children”
Authors: Melinda Sandler Morrill, North Carolina State University
Published: forthcoming, Journal of Health Economics
Abstract: The effects of maternal employment on children’s health are theoretically ambiguous and challenging to identify. There are trade-offs between income and time, and a mother’s decision to work reflects, in part, her children’s health and her underlying preferences. I utilize exogenous variation in each child’s youngest sibling’s eligibility for kindergarten as an instrument. Using the restricted-access National Health Interview Survey (1985–2004), I identify the effects on overnight hospitalizations, asthma episodes, and injuries/poisonings for children ages 7–17. Maternal employment increases the probability of each adverse health event by nearly 200 percent. These effects are robust and do not reflect a non- representative local effect.