Table 2.
Means and standard deviations of the BDI and CDI subtests at each age level
| Age | |||||
|---|---|---|---|---|---|
| 9 months | 12 months | 15 months | 18 months | 21 months | |
| BDI | |||||
| N | 22 | 22 | 23 | 22 | 20 |
| Rec.Comm. | 6.36 (2.89) | 11.82 (2.97) | 16.09 (3.72) | 21.55 (4.03) | 25.45 (3.85) |
| Exp. Comm | 8.23 (1.63) | 12.38 (2.01) | 16.00 (3.32) | 20.18 (4.68) | 26.00 (5.88) |
| Att/Mem | 9.59 (2.94) | 14.38 (3.06) | 17.52 (2.84) | 18.77 (2.31) | 21.45 (4.09) |
| Per/Conc. | 8.86 (1.96) | 11.29 (2.10) | 14.13 (3.14) | 17.64 (2.75) | 21.85 (4.02) |
| CDI | |||||
| N | 23 | 21 | 20 | 20 | 19 |
| # Phr Und | 5.04 (4.58) | 12.30 (5.87) | 20.60 (4.63) | ||
| # Wds Und | 14.39 (20.00) | 51.05 (47.87) | 124.25 (76.50) | ||
| # Wds Prod | 1.26 (1.86) | 6.00 (11.15) | 27.50 (34.62) | 103.95 (107.74) |
187.00 (125.86) |
| # Gest Prod | 8.36 (6.35) | 21.29 (8.12) | 35.85 (10.03) | ||