Table 1.
Baseline characteristics of the intention-to-treat population
| Cardiac arrest centre group (n=414) | Standard care group (n=413) | ||
|---|---|---|---|
| Age, years | 63·8 (16) | 63·2 (16) | |
| Sex | |||
| Male | 285/412 (69%) | 275/410 (67%) | |
| Female | 127/412 (31%) | 135/410 (33%) | |
| Ethnicity | |||
| White | 224/414 (54%) | 224/413 (54%) | |
| Asian | 69/414 (17%) | 69/413 (17%) | |
| Afro-Caribbean | 21/414 (5%) | 25/413 (6%) | |
| Other | 39/414 (9%) | 45/413 (11%) | |
| Not known | 61/414 (15%) | 50/413 (12%) | |
| Medical history | |||
| Diabetes | 98/385 (26%) | 90/376 (24%) | |
| Hypertension | 182/376 (48%) | 190/372 (51%) | |
| Smoking status | |||
| Never smoked | 96/414 (23%) | 83/413 (20%) | |
| Ex-smoker | 50/414 (12%) | 53/413 (13%) | |
| Current smoker | 41/414 (10%) | 55/413 (13%) | |
| Not known | 227/414 (55%) | 222/413 (54%) | |
| Hypercholesterolaemia | 99/342 (29%) | 83/315 (26%) | |
| Peripheral vascular disease | 12/360 (3%) | 13/348 (4%) | |
| Cerebrovascular disease | 26/369 (7%) | 39/362 (11%) | |
| Chronic renal failure | 33/375 (9%) | 31/362 (9%) | |
| Known ischaemic heart disease | 83/362 (23%) | 63/353 (18%) | |
| Previous myocardial infarction | 54/364 (15%) | 48/362 (13%) | |
| Previous percutaneous coronary intervention | 46/362 (13%) | 34/349 (10%) | |
| Family history of heart disease | 32/179 (18%) | 32/168 (19%) | |
| Preceding symptoms before cardiac arrest | 122/267 (46%) | 142/260 (55%) | |
| Chest pain | 29/122 (24%) | 43/142 (30%) | |
| Dizziness | 11/122 (9%) | 29/142 (20%) | |
| Breathlessness | 50/122 (41%) | 49/142 (35%) | |
| Palpitations | 2/122 (2%) | 8/142 (6%) | |
| Other symptoms | 61/122 (50%) | 74/142 (52%) | |
Data are mean (SD) or n/N (%). Ethnicity and smoking status had “Not known” as a response category in the case report form and so the denominator for these variables is the total number of patients in the intention-to-treat population; other variables did not have this option, and therefore the denominator for all other variables is the number of patients for whom data were available.