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

Table 2 Summary of Data on Reported Fetal Hypoxia and Diagnosis of Autism Spectrum Disorders in the Same Child (All Gestational Ages at Birth)¹

Child's Gender	Autism Spectrum Disorders	Fetal Hypoxia			Total
		Present²	Absent⁴	Unknown
Both	Present N	113	530	495	1,138
	% ³	0.66	0.60	0.44	0.52
		(0.06)	(0.03)	(0.02)	(0.02)
	Total N	17,083	88,553	113,254	218,890
Male	Present N	100	452	400	952
	% ³	1.10	0.99	0.70	0.85
		(0.11)	(0.05)	(0.03)	(0.03)
	Total N	9,109	45,594	57,257	111,960
Female	Present N	13	78	95	186
	% ³	0.16	0.18	0.17	0.17
		(0.04)	(0.02)	(0.02)	(0.01)
	Total N	7,974	42,959	55,997	106,930

1: singletons born in Alberta 1998-2004 and followed up till March 31, 2008
2: at least one of the three tests for fetal hypoxia is positive, i.e. fetal scalp pH < 7.25, or umbilical artery pH < 7.20, or venous pH < 7.28
3: percentage of exposed to different states of fetal hypoxia (with standard errors)
4: excludes subjects with base pH, i.e. this reference category has pH in normal physiological range

ISSN: 1471-2288