Table 3 Variable assignment used in logistic regression and decision tree

CIMT

L-CIMT or R-CIMT met any of the following criteria

0 = normal (CIMT < 1 mm)

1 = increased CIMT (CIMT ≥ 1 mm)

Gender

0 = male

1 = female

Age

1 = young and middle-aged (age < 60 years)

2 = old age (age ≥ 60 years)

Smoking

0 = no

1 = yes

Blood pressure

0 = normal (SBP < 140 mmHg and/or DBP < 90 mmHg)

1 = hypertention (SBP ≥ 140 mmHg and/or DBP ≥ 90 mmHg)

BMI

1 = normal (BMI < 24 kg/m²)

2 = overweight (24 kg/m² ≤ BMI < 28 kg/m²)

3 = obesity (28 kg/m² ≤ BMI < 30 kg/m²)

4 = severe obesity (BMI ≥ 30 kg/m²)

Waist circumference

0 = normal (male < 90 cm, female < 85 cm)

1 = increased waist circumference (male ≥ 90 cm, female ≥ 85 cm)

VFA

0 = normal (VFA < 80 cm²)

1 = increased VFA (VFA ≥ 80 cm²)

SFA

0 = normal (SFA < 100 cm²)

1 = increased SFA (SFA ≥ 100 cm²)

Glu 0

1 = excessively controlled (Glu0 < 4.4 mmol/L)

2 = well controlled (4.4 mmol/L ≤ Glu0 ≤ 7.0 mmol/L)

3 = poorly controlled (Glu0 > 7.0 mmol/L)

Glu120

1 = well controlled (Glu120 ≤ 7.8 mmol/L)

2 = generally controlled (7.8 mmol/L < Glu120 < 10 mmol/L)

3 = poorly controlled (Glu120 ≥ 10 mmol/L)

HbA1c

1 = well controlled (HbA1c < 7 %)

2 = generally controlled (7 % ≤ HbA1c < 8 %)

3 = poorly controlled (HbA1c ≥ 8 %)

CKD

1 = G1 (eGFR ≥ 90 ml/min)

2 = G2 (60 ml/min ≤ eGFR < 90 ml/min)

3 = G3 (30 ml/min ≤ eGFR < 60 ml/min)

UA

0 = normal

1 = hyperuricemia (male > 420 ummol/L; female > 360 umol/L)

Blood lipid

0 = normal

1 = dyslipidaemia (met any of the following criteria: TG ≥ 2.26 mmol/L; TC ≥ 6.26 mmol/L; LDL≥ 4.14 mmol/L; HDL < 1.04 mmol/L)

ABI

0 = non-stenosis (L-ABI and/or R-ABI > 0.9)

1 = stenosis (L-ABI or R-ABI ≤ 0.9)