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Mean numbers of pictures referenced and mean number of utterances per picture (SDs in parentheses).
| 20 Months | 27 Months | |
|---|---|---|
| Number of pictures referenced by mothers and children | 17.22 (5.12) | 20.11 (2.74) |
| Number of utterances per picture by mothers | 4.95 (2.51) | 5.98 (1.96) |
| Number of utterances per picture by children | 1.75 (1.62) | 3.27 (1.07) |
