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Table 2 Singleton term births between 2006 and 2015 from electronic medical records at Geisinger. Note: the lower number of births in 2006 derives from the fact that these births were conceived and delivered in 2006, while for later years the number represents all deliveries in that year regardless of year of conception

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

Year of birth Births Births with pre-pregnancy weight Percent of births with pre-pregnancy weight Births also with weight within 7 days of parturition Percent of births also with weight within 7 days of parturition
2006 1470 706 48.0% 418 28.4%
2007 3626 1940 53.5% 1224 33.8%
2008 3249 1639 50.4% 1063 32.7%
2009 3351 1814 54.1% 1242 37.1%
2010 3133 1667 53.2% 1103 35.2%
2011 4440 3023 68.1% 2328 52.4%
2012 4440 3146 70.9% 2486 56.0%
2013 4256 3217 75.6% 2640 62.0%
2014 4170 3355 80.5% 2915 69.9%
2015 3623 3048 84.1% 2798 77.2%
Total 35,758 23,555 65.9% 18,217 50.9%