These features show the species recognition of factor. Among them, IPI is the most important.

这些特征参数较为稳定,为种间鉴别因子, 其中以IPI为最.

The International Prognostic Index (IPI) was effective in defining risk groups with significantly different outcomes.

国际预后指数（IPI）有助于危险分组（转归不同）。