Noad R, Stevenson M, Herity NA. Analysis of weekend effect on 30-day mortality among patients with acute myocardial infarction. Open Heart 2017;4:e000504.
Since this article was first published, errors have been identified in table 1. Some of the percentages for 30-day mortality and in-hospital mortality were calculated incorrectly. The correct table is below, and the corrected values are shown in bold.
Table 1.
Baseline characteristics among 3757 patients admitted with acute MI by day of admission and type of MI
| STEMI | NSTEMI | |||||
| Weekday (n=1591) | Weekend (n=649) | P value | Weekday (n=1131) | Weekend (n=386) | P value | |
| 30-day mortality (%)* | 101 (6.35) | 39 (6.01) | 0.423 | 46 (4.07) | 14 (3.63) | 0.412 |
| In-hospital mortality (%)* | 75 (4.71) | 28 (4.31) | 0.739 | 37 (3.27) | 12 (3.11) | 0.999 |
| Age, years† | 62.9±13.0 | 62.9±13.9 | 0.908 | 67.7±13.0 | 70.2±13.1 | 0.01 |
| Gender, male (%)* | 1161 (72.9) | 475 (73.2) | 0.999 | 789 (70.0) | 247 (64.0) | 0.180 |
| Cardiac arrest (%)* | ||||||
| None | 1367 (85.9) | 566 (87.2) | 0.378 | 1081 (95.6) | 362 (93.8) | 0.679 |
| VT/ VF | 155 (9.74) | 62 (9.55) | – | 22 (1.94) | 4 (1.04) | – |
| Asystole/PEA | 38 (2.39) | 8 (1.23) | – | 16 (1.41) | 6 (1.55) | – |
| Unknown | 31 (1.95) | 13 (2.00) | – | 12 (1.06) | 14 (3.62) | – |
| Previous MI (%)* | 177 (11.2) | 78 (12.1) | 0.701 | 351 (31.0) | 116 (30.1) | 0.579 |
| Left ventricular ejection fraction (%)* | ||||||
| Normal/mild | 480 (30.2) | 216 (33.3) | 0.549 | 506 (44.7) | 163 (42.2) | 0.164 |
| Moderate | 504 (31.7) | 199 (30.7) | – | 204 (18.4) | 79 (20.5) | – |
| Severe | 114 (7.17) | 50 (7.70) | – | 66 (5.84) | 30 (7.77) | – |
| Unknown | 493 (31.0) | 184 (28.4) | – | 355 (31.4) | 114 (29.5) | – |
| Hypertension (%)* | 539 (33.9) | 234 (36.2) | 0.246 | 613 (54.2) | 213 (55.2) | 0.651 |
| Hypercholesterolaemia(%)* | 567 (35.6) | 248 (38.2) | 0.167 | 648 (57.2) | 213 (55.2) | 0.982 |
| PVD (%)* | 79 (5.00) | 29 (4.50) | 0.652 | 97 (8.58) | 37 (9.59) | 0.765 |
| CVD (%)* | 83 (5.21) | 32 (4.93) | 0.522 | 110 (9.73) | 51 (13.2) | 0.208 |
| COPD (%)* | 218 (13.1) | 85 (13.1) | 0.565 | 208 (18.4) | 62 (16.1) | 0.604 |
| CKD (%)* | 45 (2.83) | 19 (2.92) | 0.770 | 115 (10.2) | 35 (9.07) | 0.603 |
| Smoking, current (%)* | 615 (38.7) | 257 (39.6) | 0.582 | 306 (27.1) | 96 (24.9) | 0.478 |
| Diabetes (%)* | 187 (11.7) | 78 (12.0) | 0.174 | 255 (22.5) | 77 (19.9) | 0.105 |
*Difference between groups was assessed using a χ2 test.
†Difference between groups was assessed using an independent-samples t-test. Continuous variables are summarised as mean (SD). Categorical variables are summarised as n (%).
CKD, chronic kidney disease; COPD, chronic obstructive pulmonary disease; CVD, cerebrovascular disease; MI, myocardial infarction; PEA, pulseless electrical activity; PVD, peripheral vascular disease; VF/VT, ventricular fibrillation/ventricular tachycardia.