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. 2020 Dec 11;11:97. doi: 10.1186/s13229-020-00402-w

Table 1.

Descriptive statistics for demographic and clinical covariates

Continuous variable Mean, SD, median
Maternal age (years) 29.6, 6.61, 29.5
Gestational age (days) 182.5, 9.17, 184.0
Birthweight Z-score 0, 1, 0.05
Categorical variable Number (proportion)
ASD
 Case 35 (9.3%)
 Control 344 (90.7%)
Race
 White 233 (61.5%)
 Black 112 (29.5%)
 Other 34 (9.0%)
Sex of baby
 Female 180 (47.5%)
 Male 199 (52.5%)
Mother’s smoking status
 Non-smoker 340 (89.7%)
 Smoker 39 (10.3%)
Mother’s insurance status
 Private 251 (66.2%)
 Medicaid 128 (33.8%)
Placental chorion inflammation
 Not inflamed 252 (66.5%)
 Inflamed 127 (33.6%)