Baseline | At 8-month follow-up | Differences between baseline and 8-month follow-up | ||||||||||
Myopia prevalence | SER (D) Mean (SD) | AL (mm) Mean (SD) | Myopia prevalence | SER (D) Mean (SD) | AL (mm) Mean (SD) | Changes in myopia prevalence | P value | Changes in SER (D) Mean (SD) | P value | Changes in AL (mm) Mean (SD) | P value | |
Age group (years) | ||||||||||||
6 (n=224) | 8.48% | 0.62 (0.83) | 22.70 (0.73) | 25.45% | 0.08 (1.03) | 23.01 (0.74) | 16.97% | <0.001** | −0.54 (0.54) | <0.001* | 0.30 (0.39) | <0.001* |
7 (n=236) | 18.03% | 0.33 (1.13) | 22.95 (0.80) | 36.80% | −0.22 (1.39) | 23.25 (0.87) | 18.77% | <0.001* | −0.53 (0.51) | <0.001* | 0.31 (0.20) | <0.001* |
8 (n=249) | 29.51% | 0.04 (1.36) | 23.27 (0.85) | 42.62% | −0.41 (1.47) | 23.52 (0.92) | 13.11% | <0.001* | −0.44 (0.47) | <0.001* | 0.26 (0.41) | <0.001* |
Total (n=709) | 18.97% | 0.32 (1.16) | 22.98 (0.83) | 35.25% | −0.19 (1.33) | 23.27 (0.87) | 16.28% | <0.001* | −0.50 (0.51) | <0.001* | 0.29 (0.35) | <0.001* |
Χ2 was used to compare categorical variables between groups; a paired t-test was used to compare continuous variable between groups
*Significance was set at 0.05
AL, axial length; D, diopter; SER, spherical equivalent refraction.