Table 3 Factors associated with autism in children

 Gender

  Female

ref

ref

  Male

1.596(1.244,2.021)

<0.001

1.491(1.280,1.738)

<0.001

 Maternal education

  4-year university and above

ref

ref

  3-year college

1.674(0.795,3.524)

0.175

1.235(0.839,1.819)

0.284

  High school and equivalent

3.051(1.492,6.240)

0.002

2.090(1.437,3.038)

<0.001

  Middle school and below

5.511(2.612,11.630)

<0.001

3.554(2.381,5.303)

<0.001

 Paternal education

  4-year university and above

ref

ref

  3-year college

0.960(0.576,1.599)

0.874

0.929(0.689,1.253)

0.630

  High school and equivalent

1.064(0.652,1.737)

0.803

1.081(0.808,1.445)

0.600

  Middle school and below

1.672(0.999,2.797)

0.050

1.336(0.974,1.832)

0.072

 Maternal age^a(mean, SD)

0.921(0.884,0.961)

<0.001

0.948(0.923,0.974)

<0.001

 Paternal age^a(mean, SD)

1.022(0.986,1.059)

0.232

1.003(0.980,1.027)

0.784

 Whether the only child

  Yes

ref

ref

  No

1.082(0.842,1.390)

0.539

1.014(0.863,1.192)

0.863