Effects of sex, age, and rhythm on the distribution of cardiac arrest cases of cardiac and non-cardiac aetiology by 4 hourly intervals
| Time intervals (24 h clock) | p Value | ||||||
|---|---|---|---|---|---|---|---|
| 0000 to 0359 | 0400 to 0759 | 0800 to 1159 | 1200 to 1559 | 1600 to 1959 | 2000 to 2359 | ||
| All cases (cardiac cases (%) / non-cardiac cases (%)) | 99 (8.3) / 28 (8.3) | 93 (7.8) / 35 (10.3) | 264 (22.1) / 72 (21.2) | 285 (23.8) / 69 (20.4) | 247 (20.7) / 73 (21.5) | 208 (17.4)/ 62 (18.2) | 0.587 |
| Male (cardiac cases (%) / non-cardiac cases (%)) | 80 (8.8) / 16 (7.5) | 75 (8.2) / 22 (10.4) | 189 (20.7) / 42 (19.8) | 221 (24.2) / 45 (21.2) | 191 (20.9) / 47 (22.2) | 158 (17.3) / 40 (18.9) | 0.805 |
| Female (cardiac cases (%) / non-cardiac (%) cases) | 19 (6.7) / 12 (9.4) | 18 (6.4) / 13 (10.2) | 75 (26.6) / 30 (23.6) | 64 (22.7) / 24 (18.9) | 56 (19.9) / 26 (20.5) | 50 (17.7) / 22 (17.3) | 0.627 |
| Aged ⩽ 70 years (cardiac cases (%) / non-cardiac cases (%)) | 71 (9.9) / 17 (8.6) | 63 (8.8) / 22 (11.1) | 144 (20.0) / 47 (23.7) | 150 (20.9) / 30 (15.2) | 145 (20.2) / 40 (20.2) | 146 (20.3) / 42 (21.2) | 0.433 |
| Aged > 70 years (cardiac cases (%) / non-cardiac cases (%)) | 28 (5.9) / 11 (7.8) | 30 (6.3) / 13 (9.2) | 120 (25.2) / 25 (17.7) | 135 (28.3) / 39 (27.7) | 102 (21.4) / 33 (23.4) | 62 (13.0) / 20 (14.2) | 0.431 |
| Presenting rhythm: other than VF (cardiac (%) / non-cardiac (%)) | 54 (10.1) / 26 (9.6) | 53 (9.9) / 29 (10.7) | 111 (20.8) / 56 (20.7) | 103 (19.3) / 46 (17.0) | 117 (21.9) / 62 (23.0) | 96 (18.0) / 51 (18.9) | 0.976 |
| Not survived to hospital admission (cardiac (%) / non-cardiac (%)) | 82 (8.2) / 27 (8.7) | 75 (7.5) / 34 (11.0) | 212 (21.2) / 68 (21.9) | 237 (23.7) / 61 (19.7) | 213 (21.3) / 63 (20.3) | 183 (18.3) / 57 (18.4) | 0.375 |
All percentages are proportion of the total cases occurring over 24 hours.
VF, ventricular fibrillation.