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Table 2 Continuous variables as number of subjects per quartile with elevated cTnT.

From: Determinants of cardiac troponin T elevation in COPD exacerbation – a cross-sectional study

  Quartiles  
Characteristic First Second Third Fourth p
Age, years < 64 64–73 74–80 > 80  
   n (%) 18 (17) 27 (25) 37 (32) 38 (34) < 0.001
Heart rate, beats/minute < 84 84–97 98–110 > 110  
   n (%) 16 (15) 29 (29) 31 (29) 40 (40) 0.001
CIIS, points < 6 6–13 14–22 > 22  
   n (%) 17 (15) 22 (23) 34 (36) 43 (40) < 0.001
Systolic blood pressure, mmHg < 120 120–139 140–157 > 157  
   n (%) 45 (41) 24 (24) 20 (21) 22 (20) 0.001
Diastolic blood pressure, mmHg < 65 65–76 77–88 > 88  
   n (%) 44 (37) 26 (27) 14(15) 26 (25) 0.002
Temperature, °C < 36.7 36.7–37.4 37.5–38.1 > 38.1  
   n (%) 26 (22) 37 (35) 18 (23) 27 (27) 0.9
Respiratory rate, breaths/min < 21 21–25 26–30 > 30  
   n (%) 10 (26) 11 (27) 9 (17) 20 (40) 0.04
Oxygen saturation, % < 88 88–92 93–95 >95  
   n (%) 25 (32) 18 (25) 21 (22) 20 (29) 0.06
pCO 2 , kPa < 4.8 4.8–5.5 5.6–6.7 > 6.7  
   n (%) 27 (26) 22 (22) 21 (24) 32 (36) 0.04
pH < 7.38 7.38–7.42 7.43–7.46 > 7.46  
   n (%) 42 (36) 13 (17) 26 (23) 21 (30) 0.10
FEV 1 , % of predicted < 31 31–42 43–58 > 58  
   n (%) 24 (33) 26 (33) 22 (26) 19 (20) 0.06
Creatinine, μmol/l < 62 62–76 77–97 > 97  
   n (%) 19 (18) 16 (16) 29 (30) 56 (44) < 0.001
CRP, mg/l < 13 13–56 57–163 > 163  
   n (%) 21 (20) 24 (24) 27 (24) 47 (43) 0.001
Neutrophil count, 10 6 /ml < 5.8 5.8–8.3 8.4–11.7 > 11.7  
   n (%) 14 (17) 26 (21) 30 (27) 50 (41) < 0.001
Non-neutrophil count, 10 6 /ml < 1.5 1.5–2 2.1–2.8 > 2.8  
   n (%) 40 (34) 19 (26) 21 (23) 23 (26) 0.11
Hemoglobin, mg/dl < 11.8 11.8–13.1 13.2–14.2 > 14.2  
   n (%) 49 (40) 33 (31) 16 (13) 22 (24) < 0.001
  1. P-values from univariate logistic regression.
  2. CIIS – Cardiac infarction injury score; CRP – C-reactive protein; FEV1 – Forced expiratory volume in 1 second