Table 2. Correlations of skin AF with clinical parameters.

Variable	Correlation coefficient	P value
Age, years	0.375	< 0.001
Sex	−0.07	0.936
History of smoking	0.039	0.67
Body mass index, kg/m2	−0.203	0.025
Diabetes duration, years	0.338	< 0.001
Systolic blood pressure, mmHg	0.233	0.01
Diastolic blood pressure, mmHg	0.073	0.429
HbA1c, %	−0.038	0.677
Fasting blood glucose, mg/dl	−0.013	0.886
eGFR (ml/min per 1.73 m2)	−0.321	< 0.001
Serum creatinine, mg/dl	0.206	0.023
LDL-C, mg/dl	0.031	0.733
HDL-C, mg/dl	−0.076	0.403
TG, mg/dl	−0.096	0.294
Urinary 8-isoprostane, pg/mgCr	−0.121	0.193
Urinary 8-OHdG, ng/mgCr	−0.081	0.374
MDA-LDL-C, U/dl	−0.01	0.915
max IMT, mm	0.159	0.08
mean baPWV, cm/s	0.335	< 0.001
mean ABI	−0.66	0.47
log CACS, AU	0.344	< 0.001
C-peptide, ng/ml	−0.23	0.011
N ε-(carboxymethyl) lysine, µ g/ml	0.086	0.377
3-deoxyglucosone, ng/ml	−0.147	0.13
High-sensitivity C-reactive protein, mg/l	−0.07	0.446

Spearman rank correlation coefficient