Table 2. Demographic data for the study patients.
| factors | n | % | |
| age group (years) | 0∼1 | 2285 | 59.66% |
| 1∼2 | 1545 | 40.34% | |
| Total | 3830 | 100.00% | |
| gender | girls | 1412 | 36.87% |
| boys | 2412 | 62.98% | |
| missing | 6 | 0.16% | |
| Total | 3830 | 100.00% | |
| hospital level | medical center | 2487 | 64.93% |
| regional hospital | 1343 | 35.07% | |
| Total | 3830 | 100.00% | |
| congenital heart disease | No | 3714 | 96.97% |
| Yes | 116 | 3.03% | |
| Total | 3830 | 100.00% | |
| acute aneurysm | No | 3577 | 93.39% |
| Yes | 253 | 6.61% | |
| Total | 3830 | 100.00% | |
| prolonged use of anti-platelet or anti-coagulant | No | 3364 | 87.83% |
| Yes | 466 | 12.17% | |
| Total | 3830 | 100.00% | |
| recurrence | No | 3771 | 98.46% |
| Yes | 59 | 1.54% | |
| Total | 3830 | 100.00% | |
| days of fever | No records | 620 | 16.19% |
| 0∼3 days | 299 | 7.81% | |
| 3∼6 days | 384 | 10.03% | |
| 6∼9 days | 169 | 4.41% | |
| 9∼12 days | 2385 | 62.27% | |
| Total | 3830 | 100.00% |