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Table 2 Characteristics of the study population

From: Autism spectrum disorders, endocrine disrupting compounds, and heavy metals in amniotic fluid: a case-control study

Characteristic ASD cases (n = 75) Controls (n = 135) p value
Mother’s age at delivery (median, min-max, year) 34 (17–41) 35 (21–44) 0.218
Father’s age at delivery (median, min-max, year) 35 (19–53) 35 (20–58) 0.362
Gestational week at sampling (median, min-max) 15 (11–20) 15 (10–29) 0.426
Parity (n, %)    0.797
 1st child 28 (37.30%) 48 (35.6%)  
> 2nd child 47 (62.70%) 87 (64.4%)  
Gestational age at birth (n, %)    0.424
 Preterm (< 260 days) 7 (9.30%) 15 (11.20%)  
 Term (260 days–294 days) 67 (89.30%) 113 (84.30%)  
 Post-term (> 295 days) 1 (1.30%) 6 (4.50%)  
Gender of the children (n, %)    0.731
 Female 13 (17.30%) 26 (19.30%)  
 Male 62 (82.70%) 109 (80.70%)  
Birth weight of the children (n, %)    0.521
 < 2500 g 3 (4.10%) 10 (7.50%)  
 2500 g–4000 g 57 (77.00%) 95 (70.90%)  
 > 4000 g 14 (18.90%) 29 (21.60%)  
Apgar score of the children (n, %)    0.952
> 7 70 (98.60%) 130 (98.50%)  
 < 7 1 (1.40%) 2 (1.50%)  
Congenital malformation of the children (n, %)    < 0.0001
 No 53 (70.70%) 124 (91.90%)  
 Yes 22 (29.30%) 11 (8.10%)  
  1. Student t test and chi-square test were used to compare the difference between cases and controls. Italicized values indicate statistically significant