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Table 1 Basic maternal demographic information for the birth data extracted from electronic medical records by year. There were no significant changes in these parameters between 2006 and 2015

From: A retrospective study of gestational weight gain in relation to the Institute of Medicine’s recommendations by maternal body mass index in rural Pennsylvania from 2006 to 2015

Birth year (N) Non-Hispanic white (%) Age at conception (years) Pre-pregnancy BMIa Postpartum BMI (N = 12,581)b Systolic blood pressurec (mmHg) Gestation length (days)
2006 (418) 96.9 26.2 ± 0.3 27.3 ± 0.3 29.2 ± 0.4 113.2/69.6 275.0 ± 0.4
2007 (1224) 96.1 26.6 ± 0.2 27.7 ± 0.2 28.9 ± 0.2 112.9/69.3 275.7 ± 0.2
2008 (1063) 96.6 26.7 ± 0.2 27.9 ± 0.2 29.6 ± 0.3 112.0/68.8 275.1 ± 0.2
2009 (1242) 94.1 26.8 ± 0.2 27.4 ± 0.2 29.1 ± 0.2 112.1/69.0 276.2 ± 0.2
2010 (1103) 95.1 27.1 ± 0.2 27.5 ± 0.2 29.2 ± 0.2 112.6/69.1 276.2 ± 0.2
2011 (2328) 95.1 26.9 ± 0.1 27.8 ± 0.1 29.5 ± 0.2 112.5/68.6 277.1 ± 0.2
2012 (2486) 93.6 26.8 ± 0.1 27.7 ± 0.1 29.2 ± 0.2 113.3/69.4 276.5 ± 0.1
2013 (2640) 94.7 26.8 ± 0.1 28.2 ± 0.1 29.4 ± 0.2 113.5/69.5 276.7 ± 0.1
2014 (2915) 93.4 27.0 ± 0.1 27.8 ± 0.1 29.5 ± 0.2 113.5/68.9 276.7 ± 0.1
2015 (2798) 93.9 27.1 ± 0.1 28.2 ± 0.1 29.7 ± 0.2 113.5/69.6 276.9 ± 0.1
Total (18,217) 94.5 26.9 ± 0.1 27.8 ± 0.1 29.4 ± 0.1 113.1/69.2 276.5 ± 0.1
  1. aCalculated from either a pre-pregnancy weight or the earliest prenatal visit weight within 30 days of estimated conception
  2. bFrom the postpartum visit
  3. cCalculated from either a pre-pregnancy measurement or a measurement taken at the earliest prenatal visit within 30 days of estimated conception