Table 4.
Regression analysis of factors that explain the severity in myopia †.
| (1) | (2) | (3) | |
|---|---|---|---|
| All Children | Primary School | Secondary School | |
| Length (years) | 0.13 *** | 0.15 *** | 0.10 *** |
| (8.12) | (9.38) | (4.07) | |
| Boy | 0.01 | 0.08 ** | 0.05 |
| (1.20) | (1.77) | (0.56) | |
| Growth in Height (cm) | 0.01 | 0.02 * | 0.01 |
| (1.35) | (1.87) | (0.35) | |
| BMI | 0.02 * | 0.03 ** | 0.02 |
| (1.63) | (2.00) | (0.69) | |
| Weight (kg) | −0.01 | −0.01 * | −0.00 |
| (−1.40) | (−1.74) | (−0.49) | |
| Space | −0.03 ** | −0.04 ** | 0.01 |
| (−1.84) | (−2.05) | (0.37) | |
| Income | 0.00 | −0.10 | 0.14 * |
| (0.04) | (−1.44) | (1.73) | |
| Mydriatic | 0.06 * | 0.10 ** | 0.08 |
| (1.83) | (1.84) | (0.79) | |
| Eye Care Knowledge | −0.004 ** | −0.003 ** | −0.01 |
| (−1.89) | (−1.76) | (−1.09) | |
| Genetic | 0.08 * | 0.05 * | 0.003 |
| (1.72) | (1.68) | (0.04) | |
| Private School | −0.11 ** | −0.11 ** | −0.11 |
| (−2.06) | (−1.90) | (−1.05) | |
| School Performance | −0.02 * | −0.03 *** | 0.013 |
| (−1.80) | (−2.74) | (0.57) | |
| Food Supplement | |||
| Vitamin | −0.01 | 0.14 * | −0.23 ** |
| (−0.07) | (1.87) | (−2.15) | |
| Fish oil | −0.02 | −0.08 | −0.04 |
| (−0.21) | (−0.69) | (−0.18) | |
| Activity Hours | |||
| Cram School | 0.02 * | 0.02 | 0.01 |
| (1.63) | (1.11) | (0.18) | |
| Electronics | −0.01 | −0.04 | −0.003 |
| (−0.65) | (−1.37) | (−0.11) | |
| TV | −0.01 | −0.01 | −0.02 |
| (−0.59) | (−0.36) | (−0.57) | |
| Study | 0.003 | −0.05 * | 0.05 |
| (0.14) | (−1.88) | (1.20) | |
| Sleep | −0.007 | 0.001 | −0.04 |
| (−0.31) | (0.05) | (−0.94) | |
| Ourdoor Exercise | −0.01 * | −0.003 | −0.01 |
| (−1.60) | (−0.60) | (−1.09) | |
| Middle School | 0.243 *** | ||
| (3.32) | |||
| High School | 0.0934 | ||
| (0.72) | |||
| N | 522 | 272 | 250 |
| R2 | 0.35 | 0.43 | 0.27 |
† Myopia is measured in absolute value of natural logarithm of the unit of refractive error (D) multiplied by 100. ‡ Income is in natural logarithm. Space refers to respondents’ consciousness about their living space, measured on the 5-point Likert scale. A higher value means more concern that their living conditions are not spacious enough and are harmful to their (or their children’s) vision. Length refers to years since the diagnosis of myopia. Numbers shown in the table are regression coefficients with t-values in parentheses. * p < 0.1, ** p < 0.05, *** p < 0.01.