Table 1.

Characteristics of participants in the Russian Children’s Study with serum organochlorine pesticide measurements at study entry (ages 8–9 years)

Characteristic	Total boys (n=350)
Child Characteristics	Mean ± SD or N (%)
Growth Measurements
Height (cm)	129.0 ± 6
Weight (kg)	26.6 ± 5.4
Body Mass Index (BMI)	15.9 ± 2.3
WHO Height z-score	0.12 ± 1.0
WHO BMI z-score	−0.17 ± 1.3
Birth and Neonatal History
Birth Weight (kg)	3.3 ± 0.5
Gestational Age (wks)	39.0 ± 1.8
Preterm birth (gestational age <37 wks)	33 (9)
Macronutrients
Total calories (calories)	2695.7 ± 931.0
% carbohydrates	54.3 ± 6.6
% fat	34.2 ± 5.9
% protein	11.6 ± 1.6
Other Characteristics
High blood lead levels (>5μg/dL)	86 (25)
Parental and Residential Characteristics
Any household smoking during pregnancy	58 (17)
Maternal age at son’s birth (<25 yrs)	222 (63)
Maternal age at menarche (yrs)	13 ± 1.3
Maximum Parental Education
High School or Less	29 (8)
Jr College/Technical School	198 (57)
University/Post-Graduate Training	121 (35)
Household Income, US $ per month
<175$	107 (31)
175–250$	88 (25)
>250$	154 (44)

Percentages may not total 100% due to rounding.

Missing: Birth weight, n=1; Any household smoking during pregnancy, n=5; Maternal age at birth, n=3; Maternal age at menarche, n=26; Maximum parental education, n=2; Household income, n=1; Macronutrients, n=3