Table 1.
Infant demographic information as a function of age and condition.
| Age |
CDI |
Books |
Gender |
|||
|---|---|---|---|---|---|---|
| M (SD) | Range | M (SD) | Range | M (SD) | ||
| 18-month-olds | ||||||
| No label condition | 18.6 (0.2) | 18.1–18.9 | 142 (131) | 9–438 | 5.5 (4.5) | 12 Female 12 Male |
| Label condition | 18.5 (0.2) | 18.1–18.9 | 67 (53) | 8–199 | 5.0 (4.0) | 10 Female 12 Male |
| 21-month-olds | ||||||
| No label condition | 21.6 (0.2) | 21.1–22.0 | 150 (108) | 12–393 | 4.5 (3.7) | 11 Female 14 Male |
| Label condition | 21.5 (0.3) | 21.0–22.0 | 212 (122) | 30–428 | 5.0 (4.7) | 12 Female 13 Male |
Age = age in months; CDI, number of words produced based on parental report on the MacArthur-Bates CDI; Books, number of books parents report reading with their infant daily.