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

Burstyn et al. BMC Medical Research Methodology 2011 11:2   doi:10.1186/1471-2288-11-2

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