Table 6. Comparisons of previous studies and our study.
| Study | Age range (y) | Sample size | Follow-up time | Myopia range (D) | Initial SE (D) | Change in AL (mm) | ||
| ICF | CCF | ICF | CCF | |||||
| Lau[8]–[9] | 7.8-11 | 28 | 4-7wk | -4.0 to -0.5 | -2.30±1.03 | -2.27±0.99 | -0.011 | 0.002 |
| Wan[10] | 6-10 | 25 | 4wk | -4.0 to -0.5 | -2.08±0.97 | -2.11±0.97 | - | |
| He[17] | 18-38 | 44 | 12mo | -5.0 to -0.75 | -3.46±0.90 | -3.84±0.77 | - | |
| Ren[18] | 20-36 | 50 | 1mo | -5.0 to -0.75 | -3.58±0.90 | -3.88±0.75 | - | |
| Wan[19] | 6-11 | 69 | 4wk | -4.0 to -0.5 | -2.12±0.86 | -2.17±0.81 | -0.031 | 0.003 |
| Present | 8-16 | 97 | 2y | -5.0 to -1.0 | -2.08±0.53 (L); -4.15±0.74 (M) | -1.89±0.51 (L); -4.33±0.70 (M) | 0.28 (L); 0.23 (M) | 0.31 (L); 0.30 (M) |
ICF: Increased compression factor (1.75 D) ortho-k; CCF: Conventional compression factor (0.75 D) ortho-k; SE: Spherical equivalent; L: Low myopia subjects; M: Moderate myopia.