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Table 1 Dummy variable assignment table for each variable

From: Prediction model and scoring system for the risk of atrial fibrillation recurrence in patients with atrial fibrillation and obstructive sleep apnoea syndrome: a retrospective case-control study

Variables

Rules for assigning dummy variables

AF Recurrence

No = 0, Yes = 1

Congestive HF

No = 0, Yes = 1

Hypertension

No = 0, Yes = 1

Age, year

<65 = 0, [65, 75) = 1, ≥ 75 = 2

Diabetes

No = 0, Yes = 1

Stroke/TIA

No = 0, Yes = 2

Vascular disease

No = 0, Yes = 1

Sex category

Men = 0, Women = 1

CHA2DS2-VASc score, points

[0,1] = 0, [2, 3] = 1, [4, 9] = 2

OSAS

Mild = 0, Moderate & Severe = 1

Hypoxemia

Mild = 0, Moderate & Severe = 1

CA

No = 0, Yes = 1

Eos, 10^9/L

[0.02, 0.52] = 0, <0.02 = 1, >0.52 = 2

Hb, g/L

[115, 150] = 0, <115 = 1, >150 = 2

DBIL, umol/L

≤ 8.6 = 0, >8.6 = 1

P, mmol/L

[0.85, 1.51] = 0, <0.85 = 1, >1.51 = 2

D-Dimer, ng/ml

[0, 280) = 0, ≥ 280 = 1

TT4, nmol/L

[66, 181] = 0, <66 = 1

PCT, ng/ml

≤ 0.5 = 0, (0.5, 2] = 1, >2=2

BMI, kg/m^2

[18.5, 24) = 0, <18.5 = 1, ≥ 24 = 2

  1. Notes: AF: atrial fibrillation, HF: heart failure, TIA: transient ischemic attack, OSAS: obstructive sleep apnea syndrome, CA: catheter ablation, Eos: eosinophils, Hb: hemoglobin, DBIL: direct bilirubin, P: phosphorus, TT4: total tetraiodothyronine, PCT: procalcitonin, BMI: body mass index