Table 1.

Sample Characteristics

Mean Age (SD)	12.56 (2.86)
8– 10.9 years (%)	36.2
11– 13.9 years(%)	24.1
14– 17.9 years(%)	39.7
Sex (% boys)	55.2
Race (% yes)
White	41.4
Black	32.8
Asian	10.3
American Indian	1.7
Other/Mixed	10.4
Hispanic (% yes)	13.8
Mean Framewise Displacement (SD)	0.10 (0.04)
Mean WASI FSIQ (SD)	113.0 (12.99)
Mean IUSC Total (SD)	25.81 (7.89)
Mean IUSC-12 Inhibitory (SD)	9.03 (3.49)
Mean IUSC-12 Prospective (SD)	16.78 (5.51)
Mean MASC Total Anxiety Score (SD)	50.64 (10.50)

Note: IUSC-12: Intolerance of Uncertainty Scale for Children, short version; WASI FSIQ: Weschler Abbreviated Scales of Intelligence Full Scale Intelligence Quotient; MASC: Multidimensional Anxiety Scale for Children