Table 4 

Association of Fetal Hypoxia at Birth1 and Diagnosis of Autism Spectrum Disorders2: Results of Logistic Regression Fitted with EM Algorithm for Handling Unknown Exposures That are Modeled From Maternal and Birth Characteristics Under Specific NMAR Assumption Among FullTerm Male Births 

Deviation from MAR^{3} 
Strong 
Strong 
Moderate 
Weak 


r 
0.1 
0.2 
0.5 
0.7 


Odds ratio estimate 
1.28 
1.28 
1.24 
1.20 


95% confidence interval 
1.03, 1.60 
1.03, 1.58 
1.01, 1.52 
0.99, 1.46 


Pvalue 
0.03 
0.03 
0.04 
0.06 


1: 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 2: singletons born in Alberta 19982004 and followed up till March 31, 2008, effects adjusted for birth year and socioeconomic status 3: contribution of clinical judgment to prescribing the test beyond Z; MAR = missing at random, r = 1, see Table 3 

Burstyn et al. BMC Medical Research Methodology 2011 11:2 doi:10.1186/14712288112 