Table 7.
Multiple regression analyses predicting language abilities as measured by standardized single-word vocabulary assessments.
| Predictor | B | t | p | 95% CI for B | Semi-partial r | Cohen’s ƒ2 |
|---|---|---|---|---|---|---|
| PPVT-4 SS at 48 months | ||||||
| Constant | 75.45 | 40.31 | <0.001 | [75.44 to 83.46] | ||
| CDI-EV at 24 months | 0.14 | 2.78 | 0.009 | [0.04 to 0.24] | 0.23 | 0.23 |
| CA at onset of declarative pointing | −1.34 | −7.44 | <0.001 | [−1.71 to −0.97] | −0.63 | 1.68 |
| EVT-2 SS at 48 months | ||||||
| Constant | 77.40 | 39.10 | <0.001 | [73.38 to 81.42] | ||
| CDI-EV at 24 months | 0.18 | 3.59 | 0.001 | [0.08 to 0.28] | 0.31 | 0.34 |
| CA at onset of declarative pointing | −1.22 | −6.74 | <0.001 | [−1.58 to −0.85] | −0.58 | 1.34 |
CA, chronological age in months; CDI-EV, MacArthur-Bates Communicative Development Inventory: Words and Sentences expressive vocabulary size; PPVT-4, Peabody Picture Vocabulary Test-4; EVT-2, Expressive Vocabulary Test-2; SS, standard score.
N = 36 for PPVT-4 SS, N = 37 for EVT-2 SS.
Both independent variables were centered on the sample mean.