Table 2.
Sample Descriptive Statistics
| Measure | IBR (n = 47) | PA (n = 42) | BAU (n = 44) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| Pretest | Posttest | Gain | Pretest | Posttest | Gain | Pretest | Posttest | Gain | |||||||
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| M | (SD) | M | (SD) | M | (SD) | M | (SD) | M | (SD) | M | (SD) | ||||
| Age (Months) | 55.89 | (3.73) | -- | 55.10 | (4.80) | -- | 56.30 | (3.99) | -- | ||||||
| Autism Index | 83.89 | (19.16) | -- | 80.84 | (16.07) | -- | 83.10 | (18.93) | -- | ||||||
| Vocabulary | |||||||||||||||
| Recept Voc | 78.62 | (16.93) | 87.77 | (18.88) | 9.15 | 81.50 | (18.83) | 86.45 | (19.23) | 4.95 | 83.05 | (18.67) | 86.93 | (17.01) | 3.89 |
| Express Voc | 86.87 | (17.34) | 94.54 | (20.31) | 7.67 | 88.26 | (16.98) | 90.60 | (19.78) | 2.34 | 86.73 | (18.07) | 89.14 | (18.22) | 2.41 |
| Listen Comp | 78.15 | (16.69) | 83.78 | (18.42) | 5.63 | 82.21 | (13.86) | 82.29 | (17.03) | 0.08 | 80.93 | (17.68) | 80.48 | (18.68) | −0.45 |
| Emerg Literacy | |||||||||||||||
| Phono Aware | 75.21 | (15.33) | 83.23 | (15.83) | 8.02 | 79.21 | (15.22) | 91.74 | (22.65) | 12.53 | 77.88 | (18.94) | 82.11 | (17.96) | 4.23 |
| Print Know | 103.09 | (14.74) | 105.17 | (11.88) | 2.08 | 102.73 | (15.57) | 103.64 | (15.30) | 0.91 | 106.14 | (13.92) | 105.36 | (10.15) | −0.77 |
| Word Read | 109.31 | (17.97) | 109.08 | (12.26) | −0.23 | 110.55 | (16.82) | 112.64 | (20.10) | 2.09 | 112.30 | (17.52) | 114.16 | (20.85) | 1.85 |
Note. IBR = Interactive Book Reading condition, PA = Phonological Awareness condition, BAU = Business-as-Usual condition. For Word Reading, ns = 26, 42, and 23, for IBR, PA, and BAU, respectively. Age = months old at pretest; Autism Index = Gilliam Autism Rating Scale-2 total index percentile; Recept Voc = receptive vocabulary as measured by the Peabody Picture Vocabulary Test IV; Express Voc= expressive vocabulary as measured by the Expressive One-Word Picture Vocabulary Test IV; Listen Comp = listening comprehension as measured by the Woodcock Johnson III Listening Comprehension cluster; Phono Aware = phonological awareness as measured by the Comprehensive Test of Phonological Processing Phonological Awareness subtest; Print Know = print knowledge as measured by the Test of Preschool Early Literacy Print Knowledge subtest; Word Read = word reading as measured by the Woodcock Johnson III Letter-Word Identification subtest. All tests in standard scores.