0.006*** 0.005 *** 2. You are studying the effects of total number of prenatal visits to the doctor during pregnancy on the birth weight. You control for average number of cigarettes smoked per day, average number of drinks per week, and mother's race. You have included dummies: mum White and mumBlack in your regression while the base group for race is other. Table 1 reports the estimation results. Table 1. Estimation Results (1) (2) (3) (4) logibwght) logbwght) log bwght) log bwght) Coeff./Std. Coeff./Std. Coeff./Std. Coeff/Std. err err err. err. total number of prenatal visits 0.007 -0.001 Inpvisits) (0.001) (0.004) (0.001) (0.007) avg cigarettes per day -0.003" -0.003" -0.003" -0.003 (0.001) (0.001) (0.001) (0.001) avg drinks per week -0.006 -0.006 -0.005 -0.005 (0.017) (0.017) (0.017) (0.017) =1 if mother white 0.043 0.062 0.043 -0.034 (mumWhite) (0.021) (0.059) (0.021) (0.089) =1 if mother black 0.028 0.029 -0.048 -0.123 (mum Black) (0.029) (0.029) (0.070) (0.109) mumWhite x npvisits -0.002 0.007 (0.005) (0.007) mumBlack x npvisits 0.007 0.013 (0.006) (0.009) Constant 7.997 (0.026) (0.056) (0.026) (0.087) R-squared 0.0195 0.0195 0.0203 0.0208 N. of cases 1648.0000 1648.0000 1648.0000 1648.0000 p