Fig. 2

Total GWG in women with optimal outcomes in NSAPD in comparison to IOM provisional recommendations^a. Circle represents the median GWG and the whiskers represent the 25th and 75th percentiles of GWG. Abbreviations: GWG, gestational weight gain; IOM, Institute of Medicine; NSAPD, Nova Scotia Atlee Perinatal Database. a Optimal outcome for NSAPD - 1 defined as birth at 37–42 weeks of gestation and average twin birth weight ≥ 2500 g; Optimal outcome for NSAPD - 2 defined as birth at 37–38 6/7 weeks of gestation, with both twins individually having a birth weight ≥ 2500 g