Table 6.

Correlations Between Accuracy at 25 Months and Offline Vocabulary and Grammar Measures at 12, 15, 18, and 21 Months

Age	Words understooda	Words producedb	Grammatical complexityc	M3Ld
12 months	.29*	.32*	—	—
15 months	.28*	.31	—	—
18 months	—	.39*	.18	.32*
21 months	—	.42*	.36*	.41*

Note. Mean proportion of correct shifts to the target picture. M3L = mean of the three longest utterances. Dashes indicate data are not available.

^aNumber of words reported as “understands” on the MacArthur–Bates Communicative Development Inventory (CDI): Words and Gestures (reported at 12 and 15 months).

^bNumber of words reported as “understands and says” on the CDI: Words and Gestures (reported at 12 and 15 months) or CDI: Words and Sentences (reported at 18 and 21 months).

^cNumber of times the parent chose the second (more complex) example on the complexity section of the CDI: Words and Sentences (reported at 18 and 21 months).

^dM3L reported on the CDI: Words and Sentences (reported at 18 and 21 months).

^*p < .05.