Evaluation of childhood developing via optical coherence tomography-angiography in Qamdo, Tibet, China: A prospective cross-sectional, school-based study

Table 5 Clinical characteristics of the study samples and optical coherence tomography measurements of retinal and subfoveal choroidal thickness according to different area

	Karuo (n = 83)	Dengqen (n = 69)	Markam (n = 67)	Chagyab (n = 76)	P value
Vision	4.64 ± 0.33	4.80 ± 0.26	4.88 ± 0.25	4.84 ± 0.28	< 0.0001
AL, mm	23.59 ± 1.10	23.22 ± 0.93	23.15 ± 1.01	23.22 ± 0.93	0.007
Mean Foveal Thickness, μm	248.93 ± 13.53	236.35 ± 21.37	239.24 ± 15.46	236.11 ± 20.23	< 0.0001
FAZ, mm2	0.30 ± 0.16	0.29 ± 0.11	0.27 ± 0.10	0.29 ± 0.11	0.604
FVD, mm-1	20.40 ± 2.05	20.78 ± 1.79	20.25 ± 1.59	20.72 ± 1.45	0.21
IVD, mm-1	21.77 ± 2.07	22.16 ± 1.73	21.54 ± 1.58	22.06 ± 1.40	0.091
CVD, mm-1	9.65 ± 3.08	10.00 ± 3.44	10.07 ± 2.69	10.17 ± 2.99	0.1211
cMean Foveal Thickness, μm	244.50 ± 16.60	221.9 ± 23.22	222.4 ± 21.90	222.7 ± 23.62	< 0.0001
cFAZ, mm2	0.30 ± 0.11	0.27 ± 0.10	0.25 ± 0.10	0.28 ± 0.15	0.0022
cFVD, mm-1	20.01 ± 1.98	19.47 ± 1.84	18.66 ± 2.23	19.28 ± 2.14	0.0006
cIVD, mm-1	21.20 ± 2.07	20.73 ± 1.88	21.74 ± 1.69	20.51 ± 2.13	< 0.0001
cCVD, mm-1	10.66 ± 4.37	9.66 ± 3.42	9.58 ± 3.25	9.686 ± 3.41	0.0256
Myopia rate, %	77.1	49.4	27.5	41.8	< 0.0001

AL: Axial length; FVD: Full vascular plexus density; CVD: Central vascular plexus density; IVD: Inner vascular plexus density; FAZ: Foveal avascular zone; MFT: Mean foveal thickness.