Skip to main content
. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: Ann Epidemiol. 2016 Mar 22;26(4):267–274. doi: 10.1016/j.annepidem.2016.02.012

Comparison of NSCH Study sample with US population data on adverse perinatal outcome for same birth cohorts*

Perinatal
outcome
US natality data from published
reports
Current NSCH
study sample (birth
cohorts include
1994 to 2008)


1994 1998 2001 2004 2006 2008 Total study
sample
(weighted),
n = 74,565
Sample limited
to children
without DDs
(weighted),
n = 64,478
% PTB 11.0 11.6 11.9 12.5 12.8 12.3 11.5 10.5
% LBW   7.3   7.6   7.7   8.1   8.3   8.2   9.3   7.5
% VLBW   1.0   1.5   1.4   1.5   1.5   1.5   1.5   1.2
*

There are some known differences in populations represented by NSCH and birth cohorts. NSCH data do not represent US children who died or migrated out of the country shortly after birth. Conversely, US birth cohort natality data do not include children who were born outside the United States and subsequently migrated into the United States.