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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Epidemiology. 2018 Mar;29(2):290–298. doi: 10.1097/EDE.0000000000000788

Table 1.

Descriptive statistics for 24,670 pregnancies (38,206 ultrasound visits) at the Magee-Womens Hospital, University of Pittsburgh Medical Center, Pittsburgh, PA, 1999–2013, and 240 pregnancies in the ODNSR data from the NICHD Maternal Fetal Medicine Units (MFMU) Network, 1992.

Characteristic MOMI ODNSR
Median Q1 Q3 Median Q1 Q3
EFW 1.86 0.89 2.76 0.71 0.58 0.87
Birthweight 3.27 3.64 3.64 0.71 0.59 0.85
MaternalAge 29 24 33 24 21 30
Gestational Age at Birth 39 38 40 25 23 27
Year of Birth 2008 2005 2010 1992 1992 1992

Abbreviations: Q1, First quartile; Q3, Third Quartile; EFW, Estimated Fetal Weight.