Table 2.
Number of Infants in Each Hand Preference Category According to their Acquisition Hand Preference (from the Latent Class Analysis of Developmental Trajectories across the 9 Months) and Unimanual Hand Preference (from the HI-score Classification of Hand-use for each Month).
| Hand Preference for Acquiring Objects |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| Right | Left | No Preference (NP) | |||||||
| Infant Age in Months | Hand Preference for Unimanual Manipulation |
||||||||
| Right | NP | Left | Right | NP | Left | Right | NP | Left | |
| 6 | 4 | 22 | 4 | 5 | 23 | 2 | 4 | 21 | 3 |
| 7 | 5 | 21 | 4 | 5 | 20 | 4 | 4 | 22 | 4 |
| 8 | 8 | 18 | 3 | 2 | 24 | 3 | 7 | 20 | 3 |
| 9 | 6 | 21 | 3 | 3 | 23 | 4 | 6 | 18 | 5 |
| 10 | 10 | 17 | 2 | 2 | 24 | 3 | 5 | 23 | 2 |
| 11 | 5 | 24 | 1 | 5 | 20 | 5 | 4 | 24 | 2 |
| 12 | 8 | 22 | 0 | 1 | 22 | 7 | 3 | 27 | 0 |
| 13 | 10 | 18 | 2 | 0 | 26 | 4 | 4 | 25 | 1 |
| 14 | 14 | 16 | 0 | 2 | 23 | 5 | 0 | 29 | 1 |