Demographics of 572 patients
| Demographics | Value |
|---|---|
| Sex (n = 572) | |
| Male | 255 (44.6%) |
| Female | 317 (55.4%) |
| Age of diagnosis (yr) | |
| Younger than 3 | 55 (9.7%) |
| 3∼7 | 230 (40.2%) |
| 8∼11 | 188 (32.8%) |
| 12∼14 | 73 (12.7%) |
| 15∼18 | 26 (4.5%) |
| Unilateral (n = 112) | |
| Right | 58 (51.8%) |
| Left | 54 (48.2%) |
| Average follow-up period (yr) | 6.1 |