imputed logBW
imputed VLow_BW
imputed Breastfed
imputed MomCare
imputed NonRelCare
imputed RelCare
imputed Dentist_0to3
imputed Doctor_0to3
imputed Father_HH_0to3
imputed Illness_1stYr
imputed LogInc_0to3
imputed LogIncAt3
imputed Medicaid_0to3
imputed Insurance_0to3
imputed Moth_HrsWorked_0to1
imputed Moth_HrsWorked_Avg_0to3
imputed Moth_HrsWorked_BefBirth
imputed Premature
imputed Alc_BefBirth
imputed Moth_Smoke_BefBirth
imputed PPVTat3