Table 1.

LEAF Item-Level Statistics

LEAF Subscale/Item	Mean	SD	Skewness	Kurtosis	% responding ‘0’	% responding ‘3’
Cognitive-Learning:
Comprehension and Conceptual Learning
Item 1	0.94	0.88	0.65	−0.30	36	6
Item 2	1.31	0.97	0.28	−0.85	22	15
Item 3	1.22	1.06	0.30	−1.15	32	14
Item 4	1.27	0.94	0.29	−0.78	22	12
Item 5	1.30	0.95	0.17	−0.89	23	11
Factual Memory
Item 6	1.24	1.00	0.34	−0.94	27	14
Item 7	1.20	0.99	0.38	−0.88	28	13
Item 8	1.04	0.95	0.65	−0.42	32	10
Item 9	1.32	0.94	0.31	−0.75	20	14
Item 10	1.35	0.93	0.10	−0.85	20	11
Cognitive-EF:
Attention
Item 11	1.81	1.01	−0.37	−0.97	13	31
Item 12	1.97	0.96	−0.49	−0.82	8	36
Item 13	1.93	0.92	−0.33	−0.92	6	33
Item 14	2.07	0.90	−0.56	−0.67	5	39
Item 15	1.46	0.84	0.27	−0.51	10	13
Processing Speed
Item 16	1.71	1.02	−0.12	−1.16	13	29
Item 17	1.44	1.02	0.26	−1.04	18	21
Item 18	1.51	1.08	0.02	−1.27	22	24
Item 19	1.92	1.06	−0.50	−1.06	13	40
Item 20	1.94	0.95	−0.36	−1.00	7	36
Visual-Spatial Organization
Item 21	2.07	1.03	−0.71	−0.75	10	46
Item 22	2.06	1.04	−0.69	−0.82	10	46
Item 23	0.85	0.98	0.97	−0.11	47	10
Item 24	1.51	1.17	0.04	−1.49	26	30
Item 25	1.02	0.92	0.63	−0.42	33	9
Sustained Sequential Processing
Item 26	1.77	1.02	−0.27	−1.06	13	30
Item 27	1.26	1.07	0.32	−1.13	30	17
Item 28	2.20	0.94	−0.80	−0.58	5	51
Item 29	1.91	1.00	−0.39	−1.01	9	36
Item 30	1.64	1.02	−0.03	−1.15	14	26
Working Memory
Item 31	1.77	0.96	−0.22	−0.96	10	27
Item 32	2.10	1.03	−0.78	−0.69	10	48
Item 33	1.83	0.97	−0.39	−0.84	11	29
Item 34	1.23	1.08	0.40	−1.11	31	18
Item 35	1.64	1.15	−0.16	−1.42	22	32
Novel Problem-Solving
Item 36	1.58	0.98	−0.05	−1.00	15	20
Item 37	1.77	1.02	−0.25	−1.11	13	31
Item 38	1.14	1.15	0.50	−1.21	40	20
Item 39	1.11	1.05	0.54	−0.92	36	14
Item 40	0.86	1.02	0.89	−0.42	49	10
Academic:
Mathematics Skills
Item 41	1.50	1.19	0.31	−1.52	28	30
Item 42	1.47	1.20	0.07	−1.53	30	29
Item 43	1.65	1.10	−0.16	−1.31	20	30
Item 44	1.19	1.21	0.45	−1.38	41	24
Item 45	1.56	1.17	−0.03	−1.47	25	31
Basic Reading Skills
Item 46	1.26	1.09	0.37	−1.16	30	19
Item 47	1.07	1.02	0.56	−0.84	36	12
Item 48	1.15	1.09	0.45	−1.11	36	15
Item 49	1.17	1.03	0.46	−0.92	31	14
Item 50	1.28	1.07	0.33	−1.13	28	18
Written Expression Skills
Item 51	1.50	1.10	0.03	−1.30	22	24
Item 52	1.71	1.18	−0.28	−1.42	22	35
Item 53	1.88	1.01	−0.38	−1.03	10	34
Item 54	1.85	1.10	−0.50	−1.09	17	36
Item 55	1.83	1.07	−0.39	−1.13	14	34

Note. For all items, range of answers was 0 – 3. SD = Standard Deviation; % responding ‘0’ and % responding ‘3’ = percentage of sample responding “0” (Never: not a problem; average for age) or “3” (Very Often: major daily problem), respectively, to the item. Values are not reported for % responding ‘1’ and % responding ‘2’ because these item responses were endorsed by 10% or more of the sample for all items.