Table 1.

Characteristics of study population.

Characteristics	Controls (n = 40)	Cases (n = 45)	P-value
Maternal Characteristics
Age at Delivery (years)	22.3 (4.4)	24.5 (5.4)	0.046
Ultrasound During Pregnancy (%)	87.5	88.9	0.84
Reported Folic Acid Use During Pregnancy (%)	60.0	44.4	0.15
Folate Deficiency (%)*	32.5	33.3	0.94
Plasma Folate (ng/ml)	3.5 (2.6)	4.2 (4.9)	0.39
Infant Characteristics
Sex, Male (%)	60.0	57.8	0.84
Age (Months)	8.4 (5.2)	6.4 (5.7)	0.10

Data are shown as means (standard deviations) for continuous variables or proportions for categorical variables.

^*Defined as maternal plasma folate concentration < 4 ng/ml.