Non-linear relationship between age and subfoveal choroidal thickness in Chinese patients with proliferative diabetic retinopathy

Table 3 Relationship between age and subfoveal choroidal thickness in different models

Exposure	Model I		Model II		Model III
	β (95%CI)	P value	β (95%CI)	P value	β (95%CI)	P value
Age (year)	-2.23 (-3.29 to -1.18)	< 0.0001	-1.96 (-3.03 to -0.90)	0.0004	-1.68 (-2.97 to -0.39)	0.0117

Model I adjusted for sex and ocular axial length; Model II adjusted for sex, ocular axial length, anti-vascular endothelial growth factor (VEGF) therapy, pan-retinal photocoagulation (PRP), insulin treatment, oral glucose-lowering drugs, and calcium antagonists; Model III adjusted for sex, ocular axial length, anti-VEGF therapy, PRP, insulin treatment, oral glucose-lowering drugs, calcium antagonists, diastolic blood pressure, hemoglobin A1c, duration of diabetes, serum creatinine, and total cholesterol. CI: Confidence interval; DBP: Diastolic blood pressure; HbA1c: Hemoglobin A1c; SFCT: Subfoveal choroidal thickness; VEGF: Vascular endothelial growth factor; PRP: Pan-retinal photocoagulation.