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

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

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 conditions^a	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 variable^b	5,254 (7.3)	66,272
Death before 28 days	102 (0.2)	66,170
Birth defect^c	3,424 (5.2)	62,746

a. as identified in Table 1.
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.
c. [28]

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