Table 1

Baseline patient characteristics

AIP group (N=46)Control group (N=46)p Value*
Age, median57.4 (42.3–66.9)58.1 (42.3–68.4)0.104†
Women19 (41.3)19 (41.3)1.000
URTI and/or GE18 (39.1)5 (10.9)0.002
URTI15 (32.6)1 (2.2)0.001
GE3 (6.5)4 (8.7)0.706
Heart disease‡15 (32.6)9 (19.6)0.134
Atrial fibrillation9 (19.6)1 (2.2)0.005
Hypertension16 (34.8)16 (34.8)1.000
Dyslipidaemia21 (45.7)10 (21.7)0.028
Diabetes9 (19.6)6 (13.0)0.366
Smoking30 (66.7)25 (56.8)0.346
Obesity8 (25.0)9 (19.6)0.480
Antiplatelet therapy10 (21.7)8 (17.4)0.527
Tachycardia6 (13.0)13 (30.2)0.090
Tachypnoea12 (36.4)13 (39.4)0.414
High WCC20 (44.4)23 (51.1)0.564
High CRP22 (64.7)18 (64.3)0.527
  • Categorical data are presented as number (%) and numerical data as median (IQR).

  • *McNemar's χ2 test.

  • †Snedecor and Cochran sign test.

  • ‡Defined as valvular and/or ischaemic heart disease.

  • AIP, acute idiopathic pericarditis; antiplatelet therapy, aspirin and/or clopidogrel; high CRP, C reactive protein >5 mg/L; GE, gastroenteritis; obesity, body mass index ≥30 kg/m2; tachycardia, heart rate >100 bpm; tachypnoea, respiratory rate >20/min; URTI, upper respiratory tract infection; high WCC, white cell count >9.8 G/L.