Fig. 2: RCS curve of weight gain to odds radios for gestational diabetes mellitus.

A Univariate regression analysis. B Multivariable regression analysis, adjusting for maternal age and pre-pregnancy body mass index. Odds ratios are indicated by solid lines and 95% confidence intervals are indicated by shaded areas. The reference point is the lowest value for gestational diabetes mellitus, with five knots placed at the 5th, 27.5th, 50th, 72.5th, and 95th percentiles of weight gain distribution. RCS restricted cubic spline.