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Table 1 Sample demographics.

From: Paternal age increases the risk for autism in an Iranian population sample

  Children with autism spectrum disorder
(N= 179)
Comparison cohort
(N= 549,354)
p-value
Mean paternal age 33.3 32.0 0.542
Mean maternal age 27.5 26.9 0.126
Paternal education    
College graduate + (%) 35.6 10.9 0.000
< High school (%) 34.6 61.3  
Maternal education    
College graduate + (%) 30.7 7.3 0.000
< High school (%) 35.4 64.4  
Birth order    
First born (%) 55.3 43.6 0.003
Sex    
Male (%) 79.9 51.6 0.000
Consanguinity (%)    
Related parents 32.4 30.4 0.573
Urban/rural    
Urban (%) 97 79 0.000