Table 1.

Descriptive statistics for age 9, 12, and 15 youth anxiety symptom and disorder variables

Variable	N/%	M/%	SD	α
Age 9 Self-report	481/90.6	19.80	11.40	0.89
Age 9 Mother-report	487/91.7	7.97	8.02	0.90
Age 9 Father-report	420/79.1	6.72	6.54	0.88
Age 12 Self-report	470/88.5	16.70	10.53	0.90
Age 12 Mother-report	467/87.9	7.95	7.89	0.91
Age 12 Father-report	377/71.0	7.03	6.82	0.89
Age 15 Self-report	448/84.4	17.29	12.36	0.93
Age 15 Mother-report	454/85.5	6.75	7.65	0.91
Age 15 Father-report	371/69.9	6.05	6.67	0.90
Age 9 Anxiety disorders	487/91.7	12%	--	0.85
Age 12 Anxiety disorders	476/89.6	13%	--	0.96
Age 15 Anxiety disorders	458/86.3	12%	--	0.96

Note. N/% corresponds to the number and percentage of the eligible 531 participants who completed the given assessment measure. α = Internals consistency for questionnaire measures and inter-rater reliability for interview measures