Relationship between Myopia Progression and School Entrance Age: A 2.5-Year Longitudinal Study
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
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
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
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
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
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.
