COHABITATION: AN ELUSIVE CONCEPT

Rates of out-of-wedlock births in the US have increased over the past three decades and rates of cohabitation among unwed parents have risen. Consequently, unwed parenthood is decreasingly synonymous with single parenthood. As we focus more attention on unwed parents, their living arrangements, and relationships, it is becoming clear that cohabitation is an ambiguous concept that is difficult to measure. In this study, we use the Fragile Families and Child Wellbeing data to document how sensitive cohabitation estimates can be to various sources of information and we demonstrate that relationships among unwed parents fall along a continuum, from marriage-like cohabitation at one extreme to parents who have no contact at all with one another at the other. The results underscore the limitations of using binary measures of cohabitation to characterize parent relationships.

Mental Illness as a Barrier to Marriage Among Mothers With Out-of-Wedlock Births

This study explores how mental illness shapes transitions to marriage among unwed mothers using augmented data from the Fragile Families and Child Wellbeing study. We estimate proportional hazard models to assess the effects of mental illness on the likelihood of marriage over a five year period following a non-marital birth. Diagnosed mental illness was obtained from the survey respondents' prenatal medical records. We find that mothers with mental illness were about two thirds as likely as mothers without mental illness to marry, even after controlling for demographic characteristics, and that human capital, relationship quality, partner selection, and substance abuse explain only a small proportion of the effect of mental illness on marriage.

Effects of Child Health on Parents' Relationship Status

We use data from the national longitudinal Fragile Families and Child Wellbeing Study to estimate the effect of poor child health on father presence. We look at whether parents live in the same household 12-18 months after the child's birth and also at how their relationships changed along a continuum (married, cohabiting, romantically involved, friends, or not involved) during the same period. We find that having an infant in poor health reduces the likelihood that parents will live together and increases the likelihood that they will become less committed to their relationship, particularly among parents with low socioeconomic status.

Mothers' and Fathers' Labor Supply in Fragile Families: The Role of Child Health

We estimate the effect of poor child health on the labor supply of mothers and fathers post welfare reform, using a national sample of mostly unwed parents and their children-a group at high risk of living in poverty. We account for the potential endogeneity of child health and find that having a young child in poor health reduces the mother's probability of working, the mother's hours of work, and the father's hours of work. These results suggest that children's health problems may diminish their parents' capacity to invest in their health.

Mother's Labor Supply in Fragile Families: The Role of Child Health

A growing body of research indicates that low socioeconomic status in early childhood sets the stage for increasing disadvantages in both health and educational capital over the child's life course and can cause low socioeconomic status to persist for generations. The study estimated the effects of poor child health on the labor supply of mothers with one-year-old children using a national longitudinal data set that oversampled unmarried parents in the post welfare reform era. It was found that having a child in poor health reduces the mother's probability of working by eight percentage points and her hours of work by three per week when she is employed. Another important finding is that the father having children with another partner increases the mothers' labor supply, even after controlling for the focal child's health status and numerous other covariates.

Effects of Child Health on Sources of Public Support

We estimate the effects of having a child in poor health on the mother's receipt of both cash assistance and in-kind public support in the form of food, health care, and shelter. We control for a rich set of covariates, include state fixed effects, and test for the potential endogeneity of child health. Mothers with children in poor health are 5 percentage points (20%) more likely to rely on TANF and 16 percentage points more likely to rely on cash assistance (TANF and/or SSI) than those with healthy children. They are also more likely than those with healthy children to receive Medicaid and housing assistance, but not WIC or food stamps.

Prenatal Drug Use and the Production of Infant Health

We estimate the effect of illicit drug use during pregnancy on low birth weight. We use data from a national longitudinal study of urban parents that includes post-partum interviews with mothers, hospital medical record data on the mother and newborn, extensive demographic information on both parents, and information about the city where the mother resides. We address the potential endogeneity of prenatal drug use and present estimates using alternative measures of prenatal illicit drug use. Depending on how drug use is measured, we find deleterious effects of illicit drug use on low birth weight that range from 3 to 5 percentage points.

THE EFFECTS OF HEALTH ON HEALTH INSURANCE STATUS IN FRAGILE FAMILIES

We use data from the Fragile Families and Child Wellbeing study to estimate the effects of poor infant health, pre-pregnancy health conditions of the mother, and the father’s health status on health insurance status of urban, mostly unmarried, mothers and their one-year-old children. Virtually all births were covered by health insurance, but one year later about one third of mothers and over 10 percent of children were uninsured. We separately examine births that were covered by public insurance and those that were covered by private insurance. The child’s health status had no effect, for the most part, on whether the mother or child became uninsured. For publicly insured births, a maternal physical health condition made it less likely that both the mother and child became uninsured, while maternal mental illness made it more likely that both the mother and child lost insurance coverage. For privately insured births, the father’s suboptimal physical health made it more likely that the mother, but not the child, became uninsured.

Demand for Illicit Drugs by Pregnant Women

We use survey data that have been linked to medical records data and city-level drug prices to estimate the demand for illicit drugs among pregnant women. The prevalence of prenatal drug use based on post partum interviews was much lower than that based on evidence in the mothers' and babies' medical records. We found that a $10 increase in the retail price of a gram of pure cocaine decreases illicit drug use by 12 to 15%. The estimated price effects for heroin are lower than for cocaine and are less robust across alternative model specifications. This study provides the first estimates of the effects of drug prices on prenatal drug use and yields important information about the potential of drug enforcement as a tool for improving birth outcomes.

Typically Unobserved Variables (TUVs) and Selection into Prenatal Inputs: Implications for Estimating Infant Health Production Functions

We examine the extent to which infant health production functions are sensitive to model specification and measurement error. We focus on the importance of typically unobserved but theoretically important variables (TUVs), other non-standard covariates (NSCs), input reporting, and characterization of infant health. The TUVs represent wantedness, taste for risky behavior, and maternal health endowment. The NSCs include father and family structure characteristics. We estimate effects of prenatal drug use, prenatal cigarette smoking, and first trimester prenatal care on birth weight, low birth weight, and a measure of abnormal infant health conditions. We compare estimates using self-reported inputs versus input measures that combine information from medical records and self-reports. We find that TUVs and NSCs are significantly associated with both inputs and outcomes, but that excluding them from infant health production functions does not appreciably affect the input estimates. However, using self-reported inputs leads to overestimated effects of inputs, particularly prenatal care, on outcomes, and using a direct measure of infant health does not always yield input estimates similar to those when using birth weight outcomes. The findings have implications for research, data collection, and public health policy.