All statistical tests were processed through SPSS 10.0. Results Age,INSS and urine VMA of 24?h were independent factors. The median of PI was 10.5145 .Compared with high risk group,the low risk group had a higher survival rate(P= 0.001 ).

• 结果年龄、INSS和24h尿VMA为独立预后因子；PI中位数为10.；5145；低危组和高危组对生存率的影响差异具有统计学意义(P=0