Autism spectrum disorders and fetal hypoxia in a population-based cohort: Accounting for missing exposures via Estimation-Maximization algorithm

Table 1 Ascertainment of Fetal Hypoxia¹ Among Neonates

Test(s)	Subjects tested	All tests positive		At least one test positive
		Number of subjects	%	Number of subjects	%
All three tests	26	1	4	12	46
Two tests
Fetal scalp and umbilical arterial blood pH	178	27	15	77	43
Umbilical arterial and venous pH	41,245	3,583	9	8,866	21
Fetal scalp and umbilical venous blood pH	4	0	0	0	0
One test
Fetal scalp pH	47	16	34	16	34
Umbilical arterial blood pH	75,775	7,727	10	7,727	10
Venous umbilical blood pH	3,561	385	11	385	11
Any of the three tests	120,836	11,739	10	17,083	14

1: fetal scalp pH < 7.25, umbilical artery pH < 7.20, or umbilical venous pH < 7.28

ISSN: 1471-2288