Table 4. Raw, scaled and composite scores from the Bayley Scales of Infant and Toddler Development (Bayley-III) and the Wechsler Preschool and Primary Scale of Intelligence (WPPSI-III) at the one to five years of age study visits, Iquitos, Peru, September 2011 to July 2016.
| 1 year | 2 yearsa | 3 yearsb | 4 yearsc | 5 yearsd | |
|---|---|---|---|---|---|
| Bayley-III: Cognitive | |||||
| Raw [mean (sd)] | 42.6 (3.0) | 59.2 (3.2) | 67.5 (3.1) | NA | NA |
| Scaled [mean (sd)] | 11.0 (1.9) | 8.1 (1.3) | 7.4 (0.8) | NA | NA |
| Bayley-III: Receptive language | |||||
| Raw [mean (sd)] | 13.0 (1.6) | 23.9 (2.3) | 31.6 (3.4) | NA | NA |
| Scaled [mean (sd)] | 7.9 (1.9) | 8.4 (1.2) | 8.5 (1.3) | NA | NA |
| Bayley-III: Expressive language | |||||
| Raw [mean (sd)] | 13.5 (2.2) | 24.7 (3.4) | 34.1 (3.8) | NA | NA |
| Scaled [mean (sd)] | 8.9 (1.8) | 7.4 (1.5) | 7.9 (1.3) | NA | NA |
| Bayley-III: Fine Motor | |||||
| Raw [mean (sd)] | 29.2 (1.5) | 39.4 (2.1) | 47.9 (3.3) | NA | NA |
| Scaled [mean (sd)] | 10.0 (1.6) | 10.3 (1.7) | 9.6 (1.6) | NA | NA |
| WPPSI-III: Block design | |||||
| Raw [mean (sd)] | NA | NA | NA | 18.0 (2.3) | 20.1 (2.8) |
| Scaled [mean (sd)] | NA | NA | NA | 10.0 (1.2) | 8.1 (1.5) |
| WPPSI-III: Information | |||||
| Raw [mean (sd)] | NA | NA | NA | 15.2 (3.9) | 18.4 (3.7) |
| Scaled [mean (sd)] | NA | NA | NA | 7.0 (2.5) | 6.6 (2.4) |
| WPPSI-III: Matrices | |||||
| Raw [mean (sd)] | NA | NA | NA | 3.7 (3.2) | 7.5 (4.7) |
| Scaled [mean (sd)] | NA | NA | NA | 6.4 (2.7) | 6.7 (3.3) |
| WPPSI-III: Vocabulary | |||||
| Raw [mean (sd)] | NA | NA | NA | 7.2 (4.3) | 11.0 (4.8) |
| Scaled [mean (sd)] | NA | NA | NA | 6.7 (2.9) | 6.8 (2.6) |
| WPPSI-III: Picture concepts | |||||
| Raw [mean (sd)] | NA | NA | NA | 4.1 (2.5) | 6.0 (3.8) |
| Scaled [mean (sd)] | NA | NA | NA | 7.7 (2.1) | 6.3 (2.4) |
| WPPSI-III: Word reasoning | |||||
| Raw [mean (sd)] | NA | NA | NA | 2.1 (2.3) | 4.3 (3.7) |
| Scaled [mean (sd)] | NA | NA | NA | 6.3 (1.7) | 5.4 (2.1) |
| WPPSI-III: Coding | |||||
| Raw [mean (sd)] | NA | NA | NA | 4.6 (5.1) | 13.7 (6.2) |
| Scaled [mean (sd)] | NA | NA | NA | 6.8 (2.2) | 7.5 (2.0) |
| Verbal composite score [mean (sd)] | 90.7 (9.0) | 87.9 (6.6) | 89.5 (6.4) | 79.7 (11.9) | 77.0 (11.8) |
| Cognitive composite score [mean (sd)] | 105.1 (9.7) | 90.5 (6.6) | 86.8 (4.0) | 87.4 (9.5) | 81.1 (11.9) |
a Missing data for 4 participants
b Missing data for 2 participants
c Missing data for 63 participants
d Missing data for 99 participants
NA: Not applicable (scale was not administered at this study time point)