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

Table 1 Baseline characteristics of participants

Item	mean ± SD/n (%)
Age (year)	55.60 ± 10.03
SBP (mmHg)	136.98 ± 20.75
DBP (mmHg)	82.92 ± 10.90
Height (cm)	161.72 ± 8.16
Weight (kg)	62.91 ± 10.83
BMI (kg/m2)	23.99 ± 3.07
Duration of diabetes (year)	12.27 ± 6.80
Visual acuity (logMAR)	0.73 ± 0.53
IOP (mmHg)	16.28 ± 4.16
Fasting blood glucose (mmol/L)	7.40 ± 2.87
Serum urea nitrogen (mmol/L)	8.47 ± 4.39
Serum creatinine, µmol/L	145.98 ± 182.39
eGFR (mL/minutes × 1.73 m2)	66.95 ± 30.47
Uric acid (mmol/L)	377.59 ± 87.59
Triglyceride (mmol/L)	1.50 ± 0.75
Total cholesterol (mmol/L)	4.60 ± 1.19
HDL-C (mmol/L)	1.31 ± 0.41
LDL-C (mmol/L)	2.68 ± 1.02
HbA1c (%)	7.73 ± 1.74
Ocular axial length (mm)	23.17 ± 0.99
CMT (μm)	283.76 ± 122.66
SFCT (μm)	264.70 ± 83.28
Gender
Female	99 (42.31)
Male	135 (57.69)
Education level
Junior high school or below	147 (63.64)
Senior high school	40 (17.32)
College or above	44 (19.05)
Hypertension history
No	126 (53.85)
Yes	108 (46.15)
Diabetic nephropathy history
No	188 (80.34)
Yes	46 (19.66)
Stroke history
No	222 (94.87)
Yes	12 (5.13)
Anemia history
No	162 (69.23)
Yes	72 (30.77)
Heart disease history
No	222 (94.87)
Yes	12 (5.13)
PRP
None	111 (47.44)
Partial	43 (18.38)
Whole	80 (34.19)
Anti-VEGF therapy
No	175 (74.79)
Yes	59 (25.21)
Insulin treatment
No	113 (48.29)
Yes	121 (51.71)
Oral glucose-lowering drugs
No	59 (25.21)
Yes	175 (74.79)
Calcium antagonists
No	183 (78.54)
Yes	50 (21.46)

SBP: Systolic blood pressure; DBP: Diastolic blood pressure; BMI: Body mass index; HbA1c: Hemoglobin A1c; logMAR: Logarithmic minimum resolution angle; IOP: Intraocular pressure; HDL-C: High-density lipoprotein cholesterol; LDL-C: Low-density lipoprotein cholesterol; eGFR: Estimated glomerular filtration rate; CMT: Central macular thickness; SFCT: Subfoveal choroidal thickness; VEGF: Vascular endothelial growth factor; PRP: Pan-retinal photocoagulation.