Table 3.

Internal consistency by subgroups (indicated by Cronbach’s α coefficients).

Age	Males	Females
10 years	0.93	0.94
11 years	0.93	0.94
12 years	0.94	0.94
13 years	0.94	0.94
14 years	0.94	0.95
15 years	0.94	0.94
16 years	0.95	0.94
17 years	0.95	0.94