Table 1.
Participants' mean (SD) ages and scores on the MacArthur-Bates Communicative Development Inventories (CDI): Words and Sentences, Short Form A (a measure of expressive vocabulary), by Lists A–D.
| A | B | C | D | |
|---|---|---|---|---|
| N | 10 | 10 | 10 | 10 |
| Age, months | 23.2 (0.7) | 23.3 (0.8) | 22.8 (0.7) | 22.7 (0.4) |
| CDI total | 54.7 (17.6) | 53.6 (16.2) | 57.8 (29.4) | 59.1 (27.3) |
| CDI nouns subset | 32.4 (9.6) | 31.6 (10.1) | 31.6 (14.8) | 30.7 (13.1) |
| CDI verbs subset | 4.4 (3.6) | 4.2 (2.7) | 5.2 (5.3) | 6.0 (6.2) |
Note. Lists reflect assignment to one of four experimental lists differing in which word of the pair is queried and in trial order.