| http://www.w3.org/ns/prov#value | - Maternal hourly wage was estimated using the imputation model of Winkler et al.26 The imputation model predicts wage using a regression equation where the independent predictor variables are maternal characteristics, including age, age squared, education, race, ethnicity, and geographic location.ProceduresThe procedures for the original study were detailed in previous publications23,24 and are bri
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