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Table 3 Time interval from preconception study visit to conception, by eligibility status at the time of consent (n = 161)a

From: Impact of preconception enrollment on birth enrollment and timing of exposure assessment in the initial vanguard cohort of the U.S. National Children’s Study

Time interval relative to conception High non-tryer High tryer All preconception
  % % %
More than 90 days before conception 51.9 32.7 39.1
31 to 90 days before conception 9.3 16.8 14.3
30 days before or after conception 13.0 21.5 18.6
More than 30 days after conception 11.1 14.0 13.0
No preconception visit recordedb 14.8 15.0 14.9
Total 100 100 100
  1. aThe table excludes four women with an unknown estimated date of conception
  2. b11 % of all preconception women had a conception date after August 2010, a time period for which data on study visits was not available