Presenting symptoms of patients at the time of diagnosis of untreated retinoblastoma at the Beijing Tongren Hospital in the study period from August 2006 and August 2009, stratified by age at diagnosis and time elapsed since first symptoms were noticed
| Initial sign | No | Percentage | Mean age at diagnosis (months) | Lag time (weeks) |
| Leucocoria | 344 | 73 | 21 | 9 |
| Strabismus | 55 | 12 | 26 | 11 |
| Poor vision | 25 | 5 | 39 | 9 |
| Red eye | 23 | 5 | 28 | 8 |
| Others | 23 | 5 | NA | NA |
| Total | 470 | 100 |