NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Working Papers by Hassan Wehbeh

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Working Papers

January 1996The Effect of Maternal Drug Use on Birth Weight: Measurement Error in Binary Variables
with Robert Kaestner, Theodore Joyce: w5434
This paper develops a method to correct for non-random measurement error in a binary indicator of illicit drugs. Our results suggest that estimates of the effect of self reported prenatal drug use on birth weight are biased upwards by measurement error -- a finding contrary to predictions of a model of random measurement error. We show that more accurate estimates of the true effect of drug use on birth weight can be obtained by using the predicted probability of falsely reporting drug use. This suggests that out-of-sample information on drug use may improve estimates of the effect of reported drug use in other settings.

Published: Economic Inquiry, Vol. 34, no. 4, (October 1996), pp. 617-629. citation courtesy of

March 1994The Impact of Prenatal Exposure to Cocaine on Newborn Costs and Length of Stay
with Theodore Joyce, Andrew D. Racine, Sandra McCalla: w4673
This paper determines newborn costs and lengths of stay attributable to prenatal exposure to cocaine and other illicit drugs, using as a data source all parturients who delivered at a large municipal hospital in New York City between November 18, 1991 and April 11, 1992. We performed a cross-sectional analysis in which multivariate, loglinear regressions were used to analyze differences in costs and length of stay between infants exposed and unexposed prenatally to cocaine and other illicit drugs adjusting for maternal race, age, prenatal care, tobacco, parity, type of delivery, birth weight, prematurity, and newborn infection. Urine specimens, with linked obstetric sheets and discharge abstracts provided information on exposure, prenatal behaviors, costs, length of stay and discharge di...

forthcoming, Health Services Research, June 1995.

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