Table 3.
Subtest standard scores by group.
| Extremely Premature (n = 66) (<32 Weeks) |
Moderately Premature (n = 70) (32–36 Weeks) |
Full-Term Control (n = 133) (≥37 Weeks) |
Combined Premature (n = 136) (<37 Weeks) |
Combined Premature 2–17-Month-Olds (n = 63) |
Combined Premature 18–42-Month-Olds (n = 73) |
|
|---|---|---|---|---|---|---|
| M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | |
| Cognitive | 83.6 (21.1) | 93.4 (18.1) | 102.1 (15.0) | 88.7 (20.1) | 80.7 (18.5) | 95.5 (19.0) |
| Receptive Communication | 87.7 (17.7) | 94.4 (18.6) | 102.2 (15.7) | 91.1 (18.4) | 86.4 (14.7) | 95.1 (20.3) |
| Expressive Communication | 88.4 (16.7) | 96.1 (17.8) | 100.7 (16.1) | 92.4 (17.6) | 91.1 (17.4) | 93.5 (17.9) |
| Fine Motor | 81.9 (16.8) | 90.8 (14.5) | 100.6 (13.4) | 86.5 (16.2) | 82.9 (16.6) | 89.6 (15.4) |
| Gross Motor | 81.9 (15.8) | 92.4 (16.1) | 100.0 (14.0) | 87.3 (16.8) | 85.3 (18.0) | 89.0 (15.6) |
Note. Bayley-4 subtest scaled scores have a mean of 10 and a standard deviation of 3. We transformed the subtest scaled scores to standard scores (M = 100 and SD = 15) to aid their interpretation. Our statistical transformations match the conversion table in the Bayley-4 technical manual (Bayley and Aylward 2019).