Table 1

Baseline characteristics of participants and non-participants

Baseline characteristics	Participants		Non-participants		P value
Baseline characteristics	N	Parameter	N	Parameter	P value
Age (years)	434	23.2±12.5	223	24.55±11.6	0.194
Gender					0.675
Female	228	65.3	121	34.7
Male	206	66.9	102	33.1
Axial length (mm)	423	27.62±1.51	186	27.84±1.67	0.108
Spherical equivalent (dioptre)	431	−10.50±3.18	213	−10.95±3.89	0.116
Myopic maculopathy					0.224
C0	267	69.2	119	30.8
C1	96	63.6	55	36.4
C2	61	59.8	41	40.2
C3	9	52.9	8	47.1
C4	1	100.0	0	0.0
SFCT (μm)	434	153.20±72.76	132	154.89±70.92	0.858

Parameters for age, axial length, spherical equivalent and SFCT were presented with mean±SD, and that for gender and myopic maculopathy were presented with percentage (%).
C0, category 0; C1, category 1; C2, category 2; C3, category 3; C4, category 4; SFCT, subfoveal choroidal thickness.