TABLE 1.
Participant Characteristics at Baseline
| Variable | Trial Arm | |
|---|---|---|
| Intervention | Control | |
| n | 45 | 52 |
| Age, months | 30.3 (5.0) | 30.6 (5.1) |
| Receiving additional speech therapy | 20 | 14 |
| Male | 82 | 80 |
| Race | ||
| African American | 18 | 13 |
| White | 78 | 85 |
| Other | 4 | 2 |
| Having receptive and expressive delay | 69 | 72 |
| Income | 71 000 (35 000) | 60 000 (52 000) |
| Mother’s education | ||
| High school | 39 | 44 |
| Undergraduate degree | 37 | 27 |
| Graduate degree | 24 | 29 |
| Baseline scores | ||
| Cognitive skills, BSID-39 | 91.3 (8.4) | 88.6 (7.6) |
| Expressive language, PLS-412 | 75.2 (7.9) | 75.0 (7.2) |
| Receptive language, PLS-412 | 76.5 (17.3) | 73.8 (15.2) |
| Expressive vocabulary, EOWPVT-313 | 60.9 (11.5) | 59.8 (10.7) |
| Expressive vocabulary, NDW | 19.0 (17.9) | 17.2 (17.5) |
| Expressive vocabulary, MCDI14 | 92.1 (105.1) | 94.4 (97.2) |
Data are expressed as mean (SD) or %. BSID-3, Bayley Scales of Infant Development, Third Edition; PLS-4, Preschool Language Scale, Fourth Edition; EOWPVT-3, Expressive One-Word Picture Vocabulary Test, Third Edition; NDW, number of different word roots in a 20-minute play interaction; MCDI, MacArthur Bates Communication Development Inventories.