We categorized children as exposed to bereavement during prenatal life if their mothers lost a child, husband, sibling or parent during the prenatal period, ascertained via the death registry; all the remaining children were included in the unexposed cohort.
We categorized children by parental occupation and by household proximity to pesticide-treated farmland.
The child's race was reported by mothers and we categorized children into two groups: white, and black or another race.
We categorized children as either severely immunosuppressed or not based on age-specific thresholds of CD4 count, CD4%, and TLC based on WHO 2006 classifications (Table 2).
We categorized children by Z score for the following nutritional categories: weight-for-height (WAZ), weight-for-height (WHZ), and height-for-age (HAZ).
We categorized children as obese if they had a sex-specific BMI-for-age at or above the 95th percentile of the U.S. Centers for Disease Control and Prevention growth reference [ 27].
Finally, we broadly categorized children as healthy or as unhealthy as classified by a single indicator or two or more indicators of health problems.
We categorized children into three age groups: infant-preschool group, 0 5 years; school-aged group, 6 11 years; and adolescence group, 12 19 years.
In light of this, the overall percentage of correctly categorized children in our sample (86.4% based on the Inhibit and the Working Memory scales) was surprisingly similar to that reported in studies of school-aged children [ 11, 64].
We categorized children as exposed if their mothers lost an older child, a sibling, or a parent one year prior to or during pregnancy, or if the mother lost a spouse during pregnancy.
