Table 1.
AIS characteristics of the clusters (n = 29,384 AIS episodes).
| All (n = 29,384) | Cluster 1 (n = 9116) | Cluster 2 (n = 13,330) | Cluster 3 (n = 6825) | p-Value * | |
|---|---|---|---|---|---|
| Age, median (IQR) | 68.4 (58.7–78.3) |
68.7 (58.7–78.5) |
68.0 (58.4–77.9) |
68.6 (59.4–78.7) |
<0.001 |
| Male, n (%) | 17,165 (58.4) | 5320 (58.4) | 7812 (58.6) | 3967 (58.1) | 0.800 |
| Ethnicity, n (%) | |||||
| Chinese | 22,136 (75.3) | 6940 (76.1) | 9913 (74.4) | 5187 (76.0) | 0.056 |
| Malay | 4731 (16.1) | 1429 (15.7) | 2220 (16.7) | 1071 (15.7) | |
| Indian | 2021 (6.9) | 603 (6.6) | 964 (7.2) | 449 (6.6) | |
| History of stroke/TIA, n (%) | 7883 (48.2) | 2490 (48.5) | 3568 (48.2) | 1795 (48.0) | 0.867 |
| History of IHD/AF/VHD/PVD, n (%) | 9328 (51.7) | 2949 (52.6) | 4143 (51.2) | 2197 (51.2) | 0.223 |
| History of diabetes, n (%) | 11,474 (56.8) | 3511 (56.5) | 5259 (57.2) | 2659 (56.3) | 0.503 |
| History of hypertension, n (%) | 22,744 (82.9) | 7109 (83.2) | 10,241 (82.3) | 5312 (83.6) | 0.075 |
| History of hyperlipidaemia, n (%) | 18,490 (75.3) | 5783 (75.7) | 8241 (74.7) | 4393 (76.0) | 0.133 |
| Current/former smoker, n (%) | 11,673 (41.0) | 3621 (41.0) | 5367 (41.6) | 2637 (39.7) | 0.043 |
| Survived to hospital discharge, n (%) | 27,641 (94.1) | 8548 (93.8) | 12,557 (94.2) | 6431 (94.2) | 0.334 |
* Kruskal–Wallis test was used to obtain the p-values. IQR: interquartile range; TIA: transient ischaemic attack; IHD: ischaemic heart disease; AF: atrial fibrillation; VHD: valvular heart disease; PVD: peripheral vascular disease.