Risk factors and outcome | Â | Training set (n = 109)a% | Independent test set (n = 73)a | ||
---|---|---|---|---|---|
 |  | Number | % | Number | % |
Age at diagnosis (Years) | 1 | 54 | 49 | 33 | 46 |
 | > 1 | 55 | 51 | 40 | 54 |
INSS stage | Â | Â | Â | Â | Â |
 | 1 | 29 | 26 | 14 | 19 |
 | 2 | 15 | 14 | 9 | 13 |
 | 3 | 16 | 15 | 7 | 9 |
 | 4 | 33 | 30 | 35 | 48 |
 | 4s | 16 | 15 | 8 | 11 |
MYCN status | Â | Â | Â | Â | Â |
 | Normal | 91 | 83 | 61 | 83 |
 | Amplified | 18 | 17 | 12 | 17 |
Outcome | Â | Â | Â | Â | Â |
 | Good | 81 | 74 | 50 | 68 |
 | Poor | 28 | 26 | 23 | 32 |