Table 1.

Self-Reported Demographic Information about the Subsample (N = 31)

Demographic information	N
Sex
Female	18 (58%)
Male	13 (42%)
Agea
Time 1	11.08 to 12.09 years (M = 11.95, SD = 0.29)
Time 2	12.09 to 13.09 years (M = 12.85, SD = 0.39)
Time 3	13.05 to 14.11 years (M = 13.69, SD = 0.46)
Ethnicity
White British	22 (71%)
Any other White background	4 (13%)
Mixed: White and Black Caribbean	2 (7%)
Mixed: White and Asian	1 (3%)
Black or Black British: African	1 (3%)
Any other Asian background	1 (3%)

^a Exact age data were missing for two participants at Time 2 and one participant at Time 3