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Table 2 Sample selection: the number of births sequentially excluded by each exclusion criterion.

From: Optimal fetal growth for the Caucasian singleton and assessment of appropriateness of fetal growth: an analysis of a total population perinatal database

Exclusion Criterion Number (%) excluded Number remaining
All WA births 1998–2002 0 126,393
Not Caucasian 18,968 (15.0) 107,425
Multiple pregnancy 3,532 (3.3) 103,893
Stillbirth 606 (0.6) 103,287
Maternal gestational smoking 21,570 (20.9) 81,717
Growth restricting conditionsa 9,970 (12.2) 71,747
Gestation <23 or >42 weeks 146 (0.2) 71,601
Birth weight excessive for GA 75 (0.1) 71,526
Missing essential variableb 5,254 (7.3) 66,272
Death before 28 days 102 (0.2) 66,170
Birth defectc 3,424 (5.2) 62,746
  1. a. as identified in Table 1.
  2. b. Essential variables were maternal height and age, birth weight, length and head circumference: almost all exclusions at this stage were the result of missing values for maternal height.
  3. c. [28]