Table 1.
Comparison of demographic characteristics between emmetropic children and myopic children.
| Characteristic | Emmetropic children (n = 26,007) | Myopic children (n = 604) | P-value |
|---|---|---|---|
| Age (years) | 4.6 (0.9) | 4.9 (0.8) | <0.001 |
| Gender | |||
| Male | 14,088 (54.2) | 352 (58.3) | 0.050 |
| Female | 11,919 (45.8) | 252 (41.7) | |
| Maternal education | |||
| Junior high school and below | 6,491 (25.0) | 170 (28.1) | 0.153 |
| High school or technical secondary school | 7,650 (29.4) | 181 (30.0) | |
| Junior college | 6,362 (24.5) | 144 (23.8) | |
| Graduate and above | 5,504 (21.2) | 109 (18.0) | |
| Paternal education | |||
| Junior high school and below | 5,369 (20.6) | 151 (25.0) | 0.073 |
| High school or technical secondary school | 7,040 (27.1) | 156 (25.8) | |
| Junior college | 5,947 (22.9) | 133 (22.0) | |
| Graduate and above | 7,651 (29.4) | 164 (27.2) | |
| Family income (Yuan/month) | |||
| <5,000 | 3,823 (14.7) | 104 (17.2) | 0.019 |
| 5,000–10,000 | 6,813 (26.2) | 174 (28.8) | |
| 10,000–15,000 | 4,974 (19.1) | 111 (18.4) | |
| 15,000–20,000 | 3,621 (13.9) | 91 (15.1) | |
| ≥20,000 | 6,776 (26.1) | 124 (20.5) | |
| Maternal age at childbirth | 27.1 (4.2) | 27.4 (4.6) | 0.178 |
| Paternal age at childbirth | 29.7 (4.8) | 29.8 (5.1) | 0.731 |
| Parental history of myopia | <0.001 | ||
| No | 15,612 (60.0) | 219 (36.3) | |
| Yes (at least one parent with myopia) | 10,395 (40.0) | 385 (63.7) |
Mean (SD) are presented for continuous variables, and N (%) are presented for non-continuous variables.