Self-Selection, Prenatal Care, and Birthweight Among Blacks, Whites and Hispanics in New York City
AbstractMost research on birth outcomes has found a direct relationship between appropriate prenatal care and increased birthweight. Researchers concede, however, that without a randomized design, which is clearly unethical, one cannot determine how much of the association is due to the medical intervention and how much is due to the characteristics of the women receiving the care. In short, the degree of selection bias is unknown and potentially substantial. In this paper we test for selection bias and estimate its direction and magnitude. We find that adjusted mean differences in birthweight between women who obtain intermediate as opposed to inadequate prenatal care substantially underestimate the effects of care that would be observed under random assignment. In particular, ordinary least squares estimates indicate that the gains to intermediate care are 113 grams for black infants, 76 grams for white infants and 92 grams for Hispanic infants. Under random assignment, black infants would experience gains of 130 grams, whites 234 grams, and Hispanics 183 grams. The gains for adequate as opposed to intermediate care are relatively minor. The results point to adverse selection in the demand for prenatal care.
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Bibliographic InfoPaper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 3549.
Date of creation: Dec 1990
Date of revision:
Publication status: published as Journal of Human Resources, Vol. 29, no. 3, Summer 1994, pp. 762-794
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Postal: National Bureau of Economic Research, 1050 Massachusetts Avenue Cambridge, MA 02138, U.S.A.
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Other versions of this item:
- Theodore Joyce, 1994. "Self-Selection, Prenatal Care, and Birthweight among Blacks, Whites, and Hispanics in New York City," Journal of Human Resources, University of Wisconsin Press, vol. 29(3), pages 762-794.
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