Table 2.
Bayley-III-NL developmental age-equivalents (DAEs) and developmental quotients (DQs) for each age group
| Developmental domain | Age group 1 0–35.9 months |
Age group 2 36–71.9 months |
Age group 3 72–107.9 months |
Age group 4 ≥108 months |
All ages | |
|---|---|---|---|---|---|---|
| Cognitiona | Number | 6 | 12 | 7 | 7 | 32 |
| Mean DAE months (±1 SD) | 5.2 (2.8) | 18.9 (9.3) | 16.3 (7.7) | 18.1 (9.6) | 15.6 (9.4) | |
| Range DAE months | 1.0–8.0 | 7.0–38.0 | 6.0–25.0 | 5.0–30.0 | 1.0–38.0 | |
| Mean DQ (±1 SD) | 45 (27) | 40 (17) | 19 (10) | 15 (9) | 31 (20) | |
| Range DQ | 6–79 | 16–69 | 6–31 | 3–25 | 3–79 | |
| Receptive language | Number | 6 | 11 | 7 | 6 | 30 |
| Mean DAE months (±1 SD) | 4.1 (2.7) | 15.5 (9.3) | 14.3 (10.7) | 12.4 (12.4) | 12.3 (10.0) | |
| Range DAE months | 1.1–8.0 | 2.1–34.0 | 0.2–27.0 | 0.2–29.0 | 0.2–34.0 | |
| Mean DQ (±1 SD) | 35 (27) | 31 (16) | 16 (12) | 10 (9) | 24 (19) | |
| Range DQ | 7–79 | 5–53 | 0–29 | 0–23 | 0–79 | |
| Expressive language | Number | 6 | 11 | 7 | 7 | 31 |
| Mean DAE months (±1 SD) | 5.2 (1.7) | 14.8 (6.9) | 11.9 (8.2) | 11.2 (11.2) | 11.5 (8.2) | |
| Range DAE months | 2.2–7.0 | 3.2–30.0 | 1.2–21.0 | 1.0–34.0 | 1.0–34.0 | |
| Mean DQ (±1 SD) | 42 (9) | 30 (12) | 14 (10) | 9 (9) | 24 (16) | |
| Range DQ | 34–59 | 8–44 | 1–26 | 1–29 | 1–59 | |
| Fine motor functioning | Number | 6 | 11 | 7 | 6 | 30 |
| Mean DAE months (±1 SD) | 6.5 (2.1) | 19.3 (9.8) | 17.7 (8.4) | 18.5 (10.9) | 16.2 (9.7) | |
| Range DAE months | 4.0–9.0 | 7.0–35.0 | 8.0–27.0 | 6.0–31.0 | 4.0–35.0 | |
| Mean DQ (±1 SD) | 56 (24) | 40 (18) | 21 (11) | 15 (9) | 34 (22) | |
| Range DQ | 26–89 | 16–71 | 8–33 | 3–25 | 3–89 | |
| Gross motor functioning | Number | 5 | 11 | 7 | 6 | 29 |
| Mean DAE months (±1 SD) | 9.0 (3.1) | 19.3 (6.8) | 18.7 (6.3) | 17.8 (7.1) | 17.1 (7.0) | |
| Range DAE months | 4.1–12.0 | 9.0–33.0 | 9.0–27.0 | 6.00–26.0 | 4.1–33.0 | |
| Mean DQ (±1 SD) | 76 (24) | 40 (9) | 21 (8) | 14 (7) | 36 (24) | |
| Range DQ | 59–119 | 20–54 | 10–29 | 4–22 | 4–119 |
DAE developmental age-equivalent, DQ developmental quotient
aData of individual 31 were excluded from this table because WPPSI-III-NL results cannot be compared with the Bayley-III-NL. The cognitive DAE for this individual was 52 months