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Table 1 Sample characteristics of the Early Markers for Autism (EMA) study

From: Maternal immune response and air pollution exposure during pregnancy: insights from the Early Markers for Autism (EMA) study

  Total (n = 957) ASD without ID (n = 199) ASD with ID (n = 180) ID only (n = 164) GP (n = 414) p value
Mean (SD) or %
Mom age (years) 28.9 (5.7) 30.3 (5.6) 29.6 (5.8) 27.1 (6.1) 28.7 (5.4) < 0.01
Dad age (years) 35.1 (15.8) 34.9 (12.6) 36.2 (16.5) 36.6 (21) 34.1 (14.3) 0.26
Birthweight (g) 3371.9 (595.5) 3437 (615) 3404.9 (519.7) 3157.8 (705.6) 3411 (551.2) < 0.01
Child sex
 Female 21.8 17.6 19.4 41.5 17.1 < 0.01
 Male 78.2 82.4 80.6 58.5 82.9
Maternal race
 White 78.9 77.9 71.7 86.6 79.5 0.04
 Asian 11.6 13.1 16.7 5.5 11.1
 Others 9.5 9.0 11.7 7.9 9.4
Hispanic ethnicity 46.4 32.2 42.2 68.3 46.4 < 0.01
Public insurance 35.6 19.6 32.2 59.8 35.3 < 0.01
County
 Orange County 45.4 42.7 38.9 32.3 54.6 <0.01
 San Diego 52.6 56.3 59.4 63.4 43.5
 Imperial 2.1 1.0 1.7 4.3 1.9
  1. Note: p value for ANOVA/chi-squared test for difference across diagnostic groups. SD standard deviation