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. 2018 Jun 14;8(6):e020694. doi: 10.1136/bmjopen-2017-020694

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Serial mediation models of the indirect associations of socioeconomic status (SES) and small-for-gestational-age (SGA). Unstandardised regression coefficients are a1, a1', a2, a3, a4, a5, a6, b1, b2, b3, b4, b5, b6, c. Adjusted for maternal age and passive smoking during pregnancy. BMI, body mass index; GWG, gestational weight gain; IOM, Institute of Medicine.