Table 3.
Confusion matrix of training and testing dataset for decision tree and rules extracted through decision tree model
| Training model | Testing model | ||||
|---|---|---|---|---|---|
| Predicted outcome | Predicted outcome | ||||
| Positive PWV index | Negative PWV index | Positive PWV index | Negative PWV index | ||
| Actual outcome | Actual outcome | ||||
| Positive PWV index | 134 | 51 | Positive PWV index | 48 | 21 |
| Negative PWV index | 39 | 204 | Negative PWV index | 22 | 78 |
| Sensibility | 73% | Sensibility | 70% | ||
| Specificity | 82% | Specificity | 78% | ||
| AUC | 0.76 | AUC | 0.73 | ||
| Rules extracted through decision tree model |
|---|
| R1: IF diabetes, CRP ≥0.7 mg/L and previous CV disease, then class: persons with positive PWV index (85.2%) |
| R2: IF diabetes, CRP ≥0.7 mg/L, no previous CV diseases, total cholesterol ≥6.1 mmol/L, carotid plaque and micro‐albuminuria, then class: persons with positive PWV index (74.1%) |
| R3: IF diabetes, CRP ≥0.7 mg/L, no previous CV diseases, total cholesterol ≥6.1 mmol/L, no carotid plaque and micro‐albuminuria, then class: persons with positive PWV index (60.0%) |
| R4: IF diabetes, CRP ≥0.7 mg/L, no previous CV diseases, total cholesterol ≥6.1 mmol/L, no carotid plaque and normo‐albuminuria, then class: persons with positive PWV index (33.3%) |
| R5: IF diabetes, CRP ≥0.7 mg/L, no previous CV diseases, total cholesterol <6.1 mmol/L, the class: persons with positive PWV index (25.0%) |
| R6: IF diabetes, CRP <0.7 mg/L, and total cholesterol ≥5.4 mmol/L, then class: persons with positive PWV index (66.7%) |
|
R7: IF no diabetes, total cholesterol ≥4.19 mmol/L, previous CV diseases, BMI ≥26 and micro‐albuminuria, then class: persons with positive PWV index (80.0%) |
| R8: IF no diabetes, total cholesterol ≥4.19 mmol/L, previous CV diseases, and BMI <26, then class: persons with positive PWV index (27.3%) |
|
R9: IF no diabetes, total cholesterol ≥4.19 mmol/L, no previous CV diseases, and micro‐albuminuria, then class: persons with positive PWV index (66.7%) |
| R10: IF no diabetes and total cholesterol <4.19 mmol/L, then class: persons with positive PWV (21.6%) |
Abbreviations: AUC, area under the curve; BMI, body mass index; CRP, C‐reactive protein; CV, cardiovascular; PWV, pulse wave velocity.