Figure 1.

The hypothesized relationship between birth complications and maternal factors (Z), fetal hypoxia (X), sex, socio-economic class and birth cohort (W), and autism spectrum disorders (Y) (when stratified on sex, W is just socio-economic class and birth cohort); bold font denotes a vector.

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