Table 1.

Demographic Characteristics of Participants by Gender

	Total Sample	Male	Female
Item	N/n (%)	n (%)	n (%)
Total participants	138	62 (45)	76 (55)
Race or ethnicity
African American	1 (0.7)	0	1 (13)
White	111 (80.4)	54 (87.1)	57 (75.0)
Hispanic	1 (0.7)	0	1 (13)
Asian	1 (0.7)	1(16)	0
American Indian/Alaska Native	1 (0.7)	0	1 (13)
Other/multiethnic	23 (16.7)	7 (11.3)	16 (21.1)
Group
Test (intervention)	122 (88)	57 (92)	65 (86)
Control	16 (12)	5 (8)	11 (14)
Socioeconomic status*
Higher	101 (73)	46 (74)	55 (72)
Lower	37 (27)	16 (26)	21 (28)
Age in years	8.5±0.6┼	8.7±0.6 ┼	8.32±0.6┼

^*Socioeconomic status determined by the school-level proportion of students receiving free or reduced-price lunch. Higher: <60% of students. Lower: ≥60% of students.

^┼Mean +/− standard deviation.