. Author manuscript; available in PMC: 2016 May 1.

Published in final edited form as: J Learn Disabil. 2013 Jul 12;48(3):227–238. doi: 10.1177/0022219413495568

Table 2.

Items, Item Response Theory (IRT) Parameters, and Classical Test Theory (CTT) Statistics of the Revised Get Ready to Read!

Item	Content	Content Domain	Discrimination Parameter	Difficulty Parameter	Item-Total Correlation^a	Percentage Correct^a
1	Find picture that shows back of book.	PK	0.55	−1.20	.39^**	72
2	Find picture with letters.	PK	0.74	−0.63	.43^**	64
3	Find picture with letters.	PK	0.73	−0.64	.44^**	64
4	Find picture with words.	PK	0.82	−1.18	.38^**	77
5	Find picture that shows the name of the cereal.	PK	0.72	−0.38	.38^**	58
6	Find the letter R.	PK	1.16	−0.88	.54^**	74
7	Find the letter G.	PK	1.02	−0.93	.45^**	74
8	Find the letter that makes the /s/ sound.	PK	0.94	−0.85	.50^**	71
9	Find the letter that makes the /t/ sound.	PK	0.97	−0.28	.56^**	57
10	Find the letter that makes the /b/ sound.	PK	0.90	−0.69	.47^**	67
11	Find the F that is written the best.	PK	0.60	−1.49	.38^**	78
12	Find the name that is written the best.	PK	0.71	−0.30	.50^**	56
13	Find the longest story.	PK	0.94	−1.33	.46^**	82
14	Find the picture of the word that starts with the /b/ sound.	PA	0.90	−0.14	.51^**	53
15	Find the picture of the word that starts with the /b/ sound.	PA	0.87	−0.52	.47^**	62
16	Find the picture of the word that rhymes with “ball.”	PA	0.72	0.33	.49^**	42
17	Find the picture of the word that is “sea - shell.”	PA	0.49	−1.66	.32^**	77
18	Find the picture of the word that is “pen - guin.”	PA	0.49	−1.40	.37^**	73
19	Find the picture of the word that is “m - oon.”	PA	0.43	−0.50	.37^**	58
20	Find the picture of the word that rhymes with “arm.”	PA	0.76	0.77	.37^**	32
21	Find the picture of the word that rhymes with “hat.”	PA	0.64	0.29	.36^**	43
22	Find the picture that has numbers in it.	PK	1.09	−0.37	.46^**	59
23	Find the one that shows how to write two words.	PK	0.40	0.69	.28^**	39
24	Find the word that is written the best.	PK	0.62	0.06	.35^**	48
25	Find the picture that is “scar” without “sss.”	PA	0.42	0.72	.05^*	34

Note. N = 1,351. PA = phonological awareness; PK = print knowledge.

CTT analogs to discrimination and difficulty parameters.

p < .05.

^**

p < .01.