Characteristics of study participants (n=134)
| Characteristic | Category | Cases (n=70) | Controls (n=64) | p Value |
|---|---|---|---|---|
| Age group | ||||
| 40–49 | 8 (11.4) | 13 (20.3) | 0.61 | |
| 50–59 | 19 (27.1) | 18 (28.1) | ||
| 60–69 | 19 (27.1) | 15 (23.4) | ||
| 70–79 | 17 (24.3) | 11 (17.2) | ||
| 80+ | 7 (10.0) | 7 (10.9) | ||
| Gender | ||||
| Female | 13 (18.6) | 15 (23.4) | 0.49 | |
| Male | 57 (81.4) | 49 (76.6) | ||
| Admission month | ||||
| September | 8 (11.4) | 7 (10.9) | 0.92 | |
| October | 12 (17.1) | 15 (23.4) | ||
| November | 15 (21.4) | 14 (21.9) | ||
| December | 10 (14.3) | 10 (15.6) | ||
| January | 14 (20.0) | 11 (17.2) | ||
| February | 11 (15.7) | 7 (10.9) | ||
| Ethnicity | ||||
| Asian or Asian British | 18 (25.7) | 6 (9.4) | 0.03 | |
| Black or Black British | 2 (2.9) | 0 (0.0) | ||
| Mixed | 0 (0.0) | 1 (1.6) | ||
| White | 50 (71.4) | 57 (89.1) | ||
| BMI category | ||||
| 18.5–24.9 | 20 (30.8) | 23 (39.0) | 0.41 | |
| 25.0–29.9 | 36 (55.4) | 24 (40.7) | ||
| 30.0–39.9 | 8 (12.3) | 10 (17.0) | ||
| 40.0–max | 1 (1.5) | 2 (3.4) | ||
| Smoker | ||||
| No never | 22 (31.4) | 23 (35.9) | 0.77 | |
| Yes current | 27 (38.6) | 21 (32.8) | ||
| Yes ex | 21 (30.0) | 20 (31.3) | ||
| Medical history | ||||
| Hypercholesterolaemia* | 34 (48.6) | 28 (43.8) | 0.58 | |
| Diabetes | 14 (20.0) | 12 (18.8) | 0.86 | |
| Hypertension | 37 (52.9) | 26 (40.6) | 0.16 | |
| AMI | 14 (20.0) | 5 (7.8) | 0.04 | |
| Stroke | 1 (1.4) | 4 (6.3) | 0.14 | |
| Family history | ||||
| AMI | 43 (61.4) | 19 (29.7) | <0.001 | |
| Stroke | 5 (7.1) | 6 (9.4) | 0.64 | |
| Influenza vaccination status† | ||||
| Vaccinated | 30 (42.9) | 29 (45.3) | 0.78 |
*28 cases (40%) and 25 controls (39%) with hypercholesterolaemia reported current statin use.
†‘Vaccinated’ refers to receiving influenza vaccination in the current vaccination year (since September 2009).
AMI, acute myocardial infarction; BMI, body mass index.