TABLE 2.

Characteristics of the participants.

Variable
Number	448
Age (years), mean ± SD	7.29 ± 0.46
Gender (boys), N (%)	245 (54.70%)
Baseline SE (D), median (Q1, Q3)	−0.14 (−0.46, 0.33)
Baseline AL (mm), mean ± SD	22.96 ± 0.77
Baseline CRC (mm), mean ± SD	7.80 ± 0.26
Baseline AL/CRC, median (Q1, Q3)	2.95 (2.90, 2.99)
ΔSE (D), median (Q1, Q3)	−1.13 (−2.07, 0.33)
ΔAL (mm), median (Q1, Q3)	1.04 (0.70, 1.40)
ΔCRC (mm), median (Q1, Q3)	−0.05 (−0.09, 0.02)
ΔAL/CRC, median (Q1, Q3)	0.15 (0.11, 0.21)
Near work time (hours/day), median (Q1, Q3)	2.09 (1.00, 3.00)
Outdoor time (hours/day), median (Q1, Q3)	2.12 (1.00, 3.00)

SE, spherical equivalent refraction; D, diopter; AL, axial length; CRC, corneal radius of curvature. Δ indicates the changes in SE, AL, CRC, and AL/CRC during 3.5-year follow-up.