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Adjusted HRs (solid line) and 95% confidence intervals (dashed lines) for stillbirth according to maternal prepregnancy BMI (in kg/m2; reference value is a BMI of 20). Dose-response relations were modeled with a 4-knot restricted cubic spline at BMI values of 18.7, 21.7, 24.2, 28.0, and 38.5.
