Table 2.
Comparison of 2.5-year follow-up characteristics between 332 grade-two and 217 grade-three students who were 8 years old at baseline.
| Characteristic | Baseline | 1 year later | 2 year later |
|---|---|---|---|
| SER (D) | |||
| Grade 2: 8 years old | −0.29 ± 0.93 | −0.40 ± 1.19 | −0.73 ± 1.45 |
| Grade 3: 8 years old | −0.52 ± 1.29 | −0.73 ± 1.37 | −1.14 ± 1.81 |
| T | 2.256 | 2.655 | 2.757 |
| p value∗ | 0.025 | 0.008 | 0.006 |
|
| |||
| CRC (mm) | |||
| Grade 2: 8 years old | 7.86 ± 0.26 | 7.85 ± 0.25 | 7.85 ± 0.26 |
| Grade 3: 8 years old | 7.82 ± 0.24 | 7.82 ± 0.25 | 7.84 ± 0.26 |
| t | 1.614 | 0.31 | 0.489 |
| p value∗ | 0.107 | 0.757 | 0.625 |
|
| |||
| AL (mm) | |||
| Grade 2: 8 years old | 23.21 ± 0.83 | 23.47 ± 0.90 | 23.78 ± 0.96 |
| Grade 3: 8 years old | 23.39 ± 0.97 | 23.67 ± 1.02 | 24.00 ± 1.07 |
| t | −2.217 | −3.097 | −2.461 |
| p value∗ | 0.027 | 0.002 | 0.014 |
|
| |||
| ACD (mm) | |||
| Grade 2: 8 years old | 3.33 ± 0.32 | 3.45 ± 0.25 | 3.48 ± 0.25 |
| Grade 3: 8 years old | 3.35 ± 0.29 | 3.49 ± 0.24 | 3.53 ± 0.26 |
| t | −0.836 | −1.439 | −1.965 |
| p value∗ | 0.403 | 0.151 | 0.05 |
|
| |||
| AL/CRC | |||
| Grade 2: 8 years old | 2.96 ± 0.08 | 2.98 ± 0.09 | 3.03 ± 0.11 |
| Grade 3: 8 years old | 2.99 ± 0.10 | 3.03 ± 0.11 | 3.06 ± 0.12 |
| t | −4.072 | −4.386 | −3.323 |
| p value∗ | ＜0.001 | ＜0.001 | 0.001 |
SER, spherical equivalent refraction; CRC, corneal radius of curvature; AL, axial length; ACD, anterior chamber depth; D, diopters; values are means ± standard deviations. ∗The t-test was used to analyze the difference between grade groups.