Inpatient investigations
| Parameter | Troponin -positive group (n, %) | Troponin-negative group (n, %) | χ2 p-value |
| Troponin positive (n=124) | Troponin negative (n=195) | ||
| Biochemical findings on admission | |||
| WCC low | 8 (6.4) | 19 (9.7) | **p=0.0003 |
| WCC normal4–11 | 74 (60.0) | 147 (75.4) | **p=0.0003 |
| WCC high | 42 (33.9) | 29 (14.9) | **p=0.0003 |
| Lymphocytes low | 65 (52.4) | 107 (54.9) | p=0.198 |
| Lymphocytes normal1–4 | 57 (46.0) | 88 (45.1) | p=0.198 |
| Lymphocytes high | 2 (1.6) | 0 (0) | p=0.198 |
| NLR<4 | 21 | 60 | *p=0.008 |
| NLR≥4 | 103 | 135 | |
| Creatinine normal | 48 | 143 | ***p<0.0001 |
| Creatinine raised | 76 | 52 | |
| LDH positive | 32 (34.5) | 58 (29.7) | p=0.549 (Fisher’s exact) |
| LDH not recorded | 92 (64.9) | 134 (68.7) | |
| D-dimer positive | 61 (49.2) | 84 (43.1) | **p=0.0028 |
| No D-dimer on system | 56 (45.2) | 74 (37.9) | |
| CRP negative (<10) | 6 (4.8) | 7 (3.6) | p=0.795 |
| CRP positive | 118 (95.1) | 188 (96.4) | p=0.7952 |
| Imaging | |||
| Transthoracic echo performed | 21 (16.9) | 33 (16.9) | p=1.0 |
| LVEF below 50% | 4 (19.0) | 1 (3.0) | p=0.0689 (Fisher’s Exact) |
| Regional wall motion abnormalities | 8 (38.1) | 1 (3.0) | **p=0.0013 (Fisher’s Exact) |
| Pericardial effusion | 2 (9.5) | 7 (21.2) | p=0.456 (Fisher’s Exact) |
| Severe aortic stenosis | 0 (0) | 0 (0) | p=1 (Fisher’s Exact) |
| CTPA performed | 14 (11.3) | 38 (19.5) | p=0.0756 |
| Pulmonary embolism detected | 4 (3.2) | 11 (5.6) | p=0.470 |
Note that where a multiclass comparator was made p-values (eg, for gender) are the same for all groups. Similarly, for some comparisons such as age, where the input data was continuous but has been converted to ordinal, the distributions of individual values within a group have been compared using a Mann-Whitney U test, and again the p-values are the same for all groups.
CRP, serum C reactive protein level; CTPA, CT pulmonary angiogram; LDH, serum lactate dehydrogenase level; LVEF, left ventricular ejection fraction; NLR, neutrophil to lymphocyte ratio; WCC, white cell count.