Fig. 1.

Trajectories estimated using linear mixed models for maternal (a) mid-upper arm circumference, (b) subscapular skinfold, (c) triceps skinfold and (d) weight, from 15 to 40 weeks’ gestation, in non-obese women with singleton pregnancies (n 1911) from twelve US sites, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Fetal Growth Studies–Singletons cohort (2009–2013). ——— indicates the estimated average trajectory and – – – – – indicate the 95 % confidence interval