Table 1.
Mean, standard deviation (SD), and range for participants' demographic information.
| Mean | SD | Range | |
|---|---|---|---|
| Age | 6.09 | 1.45 | 5–9 |
| Proportion of sex (M:F) | 50:50 | ||
| Proportion of handedness (left:right) | 12:88 | ||
| Age of acquisition for English | 2.52 | 1.31 | 0–8 |
| Socioeconomic status | 3.32 | 1.14 | 1–6 |
| Chinese vocabulary scores | 24.33 | 12.61 | 4–65 |
| English vocabulary scores | 4.93 | 2.82 | 1–15 |
| Nonverbal intelligence standardized scores | 121.85 | 13.55 | 85–150 |
| Nonverbal intelligence percentiles | 85.99 | 17.81 | 16–100 |
See Methods Section for the details of the scales and definitions of socioeconomic status. All participants' parents mentioned that their children began to learn Cantonese since birth.