Table 1.

Numbers, and observed means and variances of AP at age 5 and at age 7, and PMS data in grade 2, 4 and 6

	n	mean	sd
AP age 5	683	11.63	3.42
AP age 7	672	2.58	2.67
COM 4	622	41.17	14.25
COM 6	493	62.17	16.63
MAT 2	558	70.67	13.28
MAT 4	580	96.18	12.42
MAT 6	412	119.34	12.54
READ 2	391	44.77	20.38
READ 4	393	74.21	17.55
SPEL 2	558	119.69	7.89
SPEL 4	630	136.87	7.22
SPEL 6	466	149.68	8.25

Note: AP= Attention Problems; COM= Comprehension; MAT= Mathematics; READ= Reading; SPEL= Spelling