Table 1. Demographic Characteristics of the 5708 Trios Included in the Study.
| Characteristic | Mean (SD) |
|---|---|
| Child | |
| Age, y | 7.32 (0.87) |
| Sex, No. (%) | |
| Male sex | 2954 (51.8) |
| Female | 2754 (48.2) |
| Ocular examination values | |
| Refractive astigmatism, D | −0.73 (0.66) |
| Corneal astigmatism, D | 1.25 (0.67) |
| Spherical equivalent, D | 0.23 (1.54) |
| Axial length, mm | 23.03 (0.93) |
| Outdoor time, h/d | 1.40 (0.53) |
| Near work, D h/d | 9.22 (2.68) |
| Maternal | |
| Age, y | 39.77 (4.60) |
| Postsecondary education, No. (%) | 2494 (43.7) |
| Ocular examination values | |
| Refractive astigmatism, D | −0.79 (0.69) |
| Corneal astigmatism, D | 1.07 (0.69) |
| Paternal | |
| Age, y | 43.29 (6.22) |
| Postsecondary education, No. (%) | 2803 (49.1) |
| Ocular examination values | |
| Refractive astigmatism, D | −0.90 (0.78) |
| Corneal astigmatism, D | 1.03 (0.73) |
| Family income per month,<HK $20 000, No. (%)a | 1261 (22.1) |
Abbreviation: h/d, hours per day.
a
HK $20 000 is equivalent to US $2555.61 as of November 18, 2022.