Table 3.

Agreement Rates for Classifying Students as Reading Disabled Using Four Alternative Definitions at Six Levels of Severity

Comparison	3rd Percentile	5th Percentile	10th Percentile	15th Percentile	20th Percentile	25th Percentile
ULA vs. LA
NWF Grade 1	31	37	44	51	56	61
NWF Grade 2	23	30	41	50	58	63
ORF Grade 1	9	13	26	37	46	54
ORF Grade 2	25	36	50	57	62	64
ORF Grade 3	37	45	54	57	59	61
ULA vs. LG
NWF Grade 1	29	33	41	46	51	56
NWF Grade 2	21	28	37	46	53	59
ORF Grade 1	9	14	25	36	45	53
ORF Grade 2	23	31	42	47	50	51
ORF Grade 3	31	36	39	41	42	44
ULA vs. DD
NWF Grade 1	28	32	40	46	51	56
NWF Grade 2	21	28	38	46	54	60
ORF Grade 1	8	13	26	37	46	53
ORF Grade 2	25	35	49	55	60	61
ORF Grade 3	38	45	52	54	55	56
LA vs. LG
NWF Grade 1	71	66	66	67	69	72
NWF Grade 2	51	55	60	66	71	74
ORF Grade 1	49	54	65	73	77	81
ORF Grade 2	48	55	58	61	61	60
ORF Grade 3	54	53	50	48	48	49
LA vs. DD
NWF Grade 1	76	73	73	74	75	78
NWF Grade 2	69	69	71	75	78	81
ORF Grade 1	74	76	80	84	86	88
ORF Grade 2	75	78	80	83	83	82
ORF Grade 3	81	81	79	76	74	74
LG vs. DD
NWF Grade 1	75	71	73	74	76	79
NWF Grade 2	59	62	69	73	77	81
ORF Grade 1	64	68	79	84	86	89
ORF Grade 2	63	69	71	71	70	70
ORF Grade 3	63	62	59	60	61	63

Note: ULA = unexpected low achievement; LA = low achievement; LG = low growth; DD = dual discrepancy; ORF = Oral Reading Fluency; NWF = Nonsense Word Fluency.