Table 1

Characteristics of the participants at baseline and follow-up and the difference between sexes (mean±SD)

ParametersTotal (n=769)Boys (n=409)Girls (n=360)P value†
Age (y)
 Baseline10.90±3.1010.81±3.0411.00±3.170.39
SER (D)
 Baseline−0.52±2.25−0.35±2.06−0.72±2.430.02
 Follow-up−0.95±2.41−0.76±2.23−1.16±2.580.02
 Change−0.43±0.47*−0.42±0.47*−0.44±0.47*0.59
AL (mm)
 Baseline23.75±1.2323.93±1.1723.56±1.27<0.01
 Follow-up24.00±1.2324.19±1.1723.78±1.27<0.01
 Change0.24±0.28*0.26±0.27*0.22±0.28*0.08
RT (μm)
 Baseline233±19237±18229±19<0.01
 Follow-up236±21239±19232±22<0.01
 Change2±13*2±13*3±13*0.19
GCC (μm)
 Baseline53±1055±1051±10<0.01
 Follow-up53±1255±1151±12<0.01
 Change0±10−1±100±90.41
ORL (μm)
 Baseline180±15182±12178±12<0.01
 Follow-up183±12184±11181±13<0.01
 Change3±6*2±6*3±7*0.13
  • *P<0.05 for comparison between baseline and follow-up using a paired t-test.

  • †P for comparison between boys and girls using a t-test.

  • AL, axial length; GCC, ganglion cell complex; ORL, outer retinal layer; RT, retinal thickness; SER, spherical equivalent refraction.