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Table 1 Baseline characteristics according to CRP level groups

From: C-reactive protein for prediction of atrial fibrillation recurrence after catheter ablation

  CRP Level  
Characteristic Quartile 1
(N = 201)
Quartile 2
(N = 171)
Quartile 3
(N = 167)
Quartile 4
(N = 172)
P trend
Age, years 59.1 ± 10.7 60.1 ± 8.8 61.5 ± 8.8 61.6 ± 9.5 0.016
Female sex 42 (21) 36 (21) 45 (27) 50 (30) 0.019
Body mass index, kg/m2 25.4 ± 3.9 27.4 ± 4.0 27.7 ± 4.3 29.2 ± 6.1 < 0.001
Systolic blood pressure, mm Hg 135 ± 17 135 ± 18 135 ± 18 136 ± 20 0.78
Type of atrial fibrillation      < 0.001
 Paroxysmal 139 (70) 108 (63) 97 (58) 90 (52)  
 Persistent 61 (30) 63 (37) 69 (42) 82 (48)  
Atrial fibrillation duration, years 2.3 (0.6–6.6) 1.7 (0.5–4.8) 2.2 (0.6–6.1) 2.0 (0.6–5.6) 0.72
Echocardiographic parameters
 LAD, mm 39 ± 7 42 ± 7 42 ± 7 43 ± 6 < 0.001
 LVEF, % 58 ± 10 57 ± 9 57 ± 10 55 ± 12 < 0.001
Laboratory data
 WBC, mm3 5860 (5020–6840) 6135 (5135–7515) 6440 (5290–7820) 6900 (5740–8400) < 0.001
 Serum creatinine, μmol/l 84 (74–95) 82 (74–93) 83 (72–94) 84 (73–97) 0.94
Medical history
 Coexistent atrial flutter 36 (18) 35 (20) 30 (18) 29 (17) 0.68
 Hypertension 93 (47) 84 (50) 90 (54) 117 (69) < 0.001
 Diabetes 13 (7) 10 (6) 12 (7) 20 (12) 0.07
 Stroke 20 (10) 9 (5) 10 (6) 15 (9) 0.64
 Heart failure 11 (6) 11 (7) 16 (10) 26 (15) 0.001
 Myocardial infarction 9 (5) 8 (5) 8 (5) 13 (8) 0.23
History of amiodarone treatment      < 0.001
 Current 30 (15) 25 (15) 29 (17) 37 (22)  
 Previous use 24 (12) 29 (17) 30 (18) 40 (23)  
 Never use 147 (73) 117 (68) 108 (65) 95 (55)  
  1. Data are presented as means ± standard deviations or medians (interquartile range), and counts (percentages)
  2. P values compares quartiles of CRP levels
  3. Abbreviations: LAD left atrial diameter, LVEF left ventricular ejection fraction, WBC white blood cell count