Table 3.
Estimated Piecewise Linear Mixed Effects Model Relating Spherical Equivalent and Axial Length to Age From 12 to 18 Years Old, Stratified by Myopia Status and High School Type
| Spherical Equivalent | Axial Length | |||||
|---|---|---|---|---|---|---|
| β2 (95% CI) | β3 (95% CI) | β2 + β3 | β2 (95% CI) | β3 (95% CI) | β2 + β3 | |
| Nonmyopia in vocational high school | −0.09 (−01.2 to −0.06) | 0.04 (0.00 to 0.09) | −0.05 (−0.07 to −0.01) | 0.08 (0.07 to 0.09) | −0.05 (−0.06 to −0.03) | 0.03 (0.02 to 0.04) |
| Nonmyopia in academic high school | −0.13 (−0.16 to −0.11) | 0.07 (0.02 to 0.12) | −0.06 (−0.09 to −0.03) | 0.11 (0.10 to 0.12) | −0.05 (−0.06 to −0.03) | 0.06 (0.05 to 0.07) |
| P value | 0.090 | 0.420 | 0.270 | <0.001 | 0.450 | <0.001 |
| Myopia in vocational high school | −0.44 (−0.47 to −0.40) | 0.26 (0.21 to 0.30) | −0.18 (−0.21 to −0.15) | 0.21 (01.9 to 0.22) | −0.13 (−0.15 −0.12) | 0.08 (0.06 to 0.09) |
| Myopia in academic high school | −0.43 (−0.46 to −0.40) | 0.17 (0.14 to 0.21) | −0.26 (−0.28 to −0.24) | 0.22 (0.21 to 0.23) | −0.10 (−0.11 to −0.09) | 0.12 (0.11 to 0.13) |
| P value | 0.360 | 0.020 | <0.001 | 0.230 | <0.001 | <0.001 |
β2 = the slope (D/year) of SE when age is less than 15 years.
β3 = the change in the slope of SE at the age of 15 years.
β2 + β3 = the slope (D/year) of SE after age 15 years.
95% CI, 95% confidence interval.