Table 2: Prevalence and mean values (standard deviation) of markers of infectious colon perforation.

Colon perforation ( )No colon perforation ( ) b

Fever (>37.5°C)28%13% a
Body temperature (°C)37.2 (0.8)36.8 (0.7) b
Tachycardia (>100 bpm)21%9% a
Heart rate (bpm)87.2 (20.5)80.7 (15.0) b
Hyponatremia (<136 mmol/L)29%16% a
Sodium (mmol/L)136.9 (3.3)138.4 (3.0) b
Markedly elevated CRP (>50 mg/L)80%60% a
CRP (mg/L)131.3 (91.1)85.1 (68.7) b
Symmetroid high T-waves (>2/3 R-wave)13%11% a
AV blocks1.1%4.4% a
Pain score (1–10)4.4 (3.0)3.9 (2.8) b
Systolic blood pressure (mm Hg)136.0 (21.5)139.1 (21.7) b
Hematocrit (%)42.7 (4.6)41.7 (4.6) b
Potassium (mmol/L)4.2 (0.40)3.9 (0.40) b
Creatinine (umol/L)84.7 (37.8)79.4 (28.2) b

aTwo-tailed Fisher’s exact test; bWilcoxon rank sum test; bpm: beats per minute; CRP: C-reactive protein.