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A Causal Effect Of Mother's Marital Status On Child's Birth Weight

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Is there a causal effect of mother’s marital status on child’s birth weight? Childbearing among unmarried women has been the subject of intense public policy and public health concern for decades, much of it reflecting concerns about the impact of family structure and the economic security on children’s health and mental well-being. This report examines dataset on births in NYC in 2001 to establish if there is a causal effect between nonmarital birth and low birth weight. Let us first examine the apparent effect of mother’s marital status during childbearing on infants’ weight by running a simple regression analysis where we use “married” as a dummy variable and child’s birth weight as a dependent variable. We have the following results: Birth weight (in grams) = 3193.471 + 94.994*married The model predicts that on average, the weight of the infant at birth to be 3193.471 grams if the mother is unmarried. Also, the model predicts the baby to be on average 95 grams heavier if the mother is married. R-squared of 0.007 or 0.7% tells us that only 0.7% of the variations in birth weight can be explained by the variation in the marital status of the mother; 99.3% of the birth weight variations are due to other factors. This model does show the correlation between the mother’s marital status and child’s birth weight; however, it is impossible to say if there is a casual effect. The results are statistically significant at p<0.001 or p<0.1%: there is 0.1% chance to observe the

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