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Table 2 General characteristics of each developmental group

From: Prenatal mercury exposure, autism, and developmental delay, using pharmacokinetic combination of newborn blood concentrations and questionnaire data: a case control study

  ASD DD/AtD TD
Number 164 35 58
Gender, n (%)    
Males 149 (91 %) 22 (63 %) 46 (79 %)
Females 15 (9 %) 13 (37 %) 12 (21 %)
Maternal education, n (%)    
Less than High School or High School    
Degree 24 (15 %) 11 (31 %) 15 (26 %)
Some College or Vocational School 68 (41 %) 14 (43 %) 12 (21 %)
Bachelor’s Degree or    
Graduate/Professional Degree 72 (44 %) 23 (26 %) 31 (53 %)
Average maternal age (years) 31 30 31
Birth place of mother, n (%)    
USA 124 (75 %) 23 (66 %) 44 (76 %)
Outside USA 40 (25 %) 12 (34 %) 14 (24 %)
Child’s race/ethnicity    
White (non-Latino) 78 (47 %) 11 (31 %) 25 (43 %)
Latino 52 (32 %) 17 (49 %) 22 (38 %)
Other 34 (21 %) 7 (20 %) 11 (19 %)
Payment method for delivery, n (%)    
Public 31 (19 %) 12 (34 %) 9 (16 %)
Private 133 (81 %) 23 (66 %) 49 (84 %)