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{"construct":"Sociodemographics","factor":"Race/ethnicity","confounder_y_n":"Y","Zhu_2001a":2,"Zhu_2001b":2,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":2,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":0,"deWeger_2011":2,"Coo_2017":0,"Ball_2014":2}
{"construct":"Sociodemographics","factor":"Marital status","confounder_y_n":"Y","Zhu_2001a":2,"Zhu_2001b":2,"Zhu_1999":2,"Smith_2003":2,"Shachar_2016":0,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Sociodemographics","factor":"Paternity","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Sociodemographics","factor":"Geographic area","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":2,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Socioeconomics","factor":"SES category","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":2,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":2,"Coo_2017":2,"Ball_2014":2}
{"construct":"Socioeconomics","factor":"Income assistance","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Socioeconomics","factor":"Education","confounder_y_n":"Y","Zhu_2001a":2,"Zhu_2001b":2,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":2,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Socioeconomics","factor":"Insurance","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":2,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Reproductive Hx","factor":"Prior pregnancy outcome","confounder_y_n":"Y","Zhu_2001a":2,"Zhu_2001b":2,"Zhu_1999":2,"Smith_2003":2,"Shachar_2016":2,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":2}
{"construct":"Reproductive Hx","factor":"Hx of perinatal death","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":2,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Reproductive Hx","factor":"Hx of pregnancy loss","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Reproductive Hx","factor":"Parity/Gravidity","confounder_y_n":"Y","Zhu_2001a":2,"Zhu_2001b":2,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":2,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":2}
{"construct":"Reproductive Hx","factor":"Hx of preterm birth","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":2,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Reproductive Hx","factor":"Previous birth weight","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":2,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Reproductive Hx","factor":"Hx of abortion","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Reproductive Hx","factor":"Previous C-section","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":2,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Family Planning","factor":"1st trimester care","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Family Planning","factor":"Use of ART","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":2,"Coo_2017":0,"Ball_2014":0}
{"construct":"Health Behaviors","factor":"Smoking","confounder_y_n":"Y","Zhu_2001a":2,"Zhu_2001b":2,"Zhu_1999":2,"Smith_2003":2,"Shachar_2016":2,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":2,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Health Behaviors","factor":"Drinking","confounder_y_n":"Y","Zhu_2001a":2,"Zhu_2001b":2,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Health Behaviors","factor":"Substance use","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Underlying Health","factor":"Maternal BMI","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":2,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Underlying Health","factor":"Maternal weight","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Underlying Health","factor":"Diabetes","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":2,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Underlying Health","factor":"Hypertension","confounder_y_n":"Y","Zhu_2001a":2,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":2,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Underlying Health","factor":"Chronic diseases","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Biology/Genetics","factor":"Biology/Genetics","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Implicit (Racial) Bias","factor":"Structural racism","confounder_y_n":"Y","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Maternal Characteristics","factor":"Maternal height","confounder_y_n":"N","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":2,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Pregnancy Factors","factor":"Adequate prenatal care","confounder_y_n":"N","Zhu_2001a":2,"Zhu_2001b":2,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Pregnancy Factors","factor":"No. of prenatal visits","confounder_y_n":"N","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Pregnancy Factors","factor":"High blood pressure","confounder_y_n":"N","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":2,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Pregnancy Factors","factor":"Gestational diabetes","confounder_y_n":"N","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":2,"Salihu_2012b":2,"Hanley_2017":2,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Pregnancy Factors","factor":"Pregnancy weight gain","confounder_y_n":"N","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":2,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":0,"Ball_2014":0}
{"construct":"Pregnancy Factors","factor":"Infant sex","confounder_y_n":"N","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":0,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":0,"deWeger_2011":0,"Coo_2017":2,"Ball_2014":0}
{"construct":"Pregnancy Factors","factor":"Year of delivery","confounder_y_n":"N","Zhu_2001a":0,"Zhu_2001b":0,"Zhu_1999":0,"Smith_2003":0,"Shachar_2016":2,"Salihu_2012a":0,"Salihu_2012b":0,"Hanley_2017":2,"deWeger_2011":2,"Coo_2017":2,"Ball_2014":2}