Table 1.

C8 Health Study Participants (n = 2,292), Mid-Ohio Valley (USA), 2005–2006.

Variable	Boys (n = 1,169)	Girls (n = 1,123)
Race/ethnicity (white)	1,120 (95.8)	1,075 (95.7)
Household income (< $20,000)	334 (33.9)	336 (34.9)
Age (years)	8.3 (7.3, 9.3)	8.4 (7.3, 9.3)
Body mass index (kg/m2)	17.9 (15.6, 20.8)	17.4 (15.3, 20.5)
Height (inches)	51.0 (48.0, 54.0)	50.0 (48.0, 53.5)
Values are n (%) or median (interquartile range). The n (%) of missing values in boys and girls was as follows: household annual family income: 184 (16%) and 160 (14%); body mass index: 179 (15%), and 187 (17%); and height: 168 (14%) and 180 (16%). Missing values were not considered for descriptive analyses.