ssas 发病率: 1/133=0.007519 7/79=0.088608 25/228=0.109649 12/72=0.166667 07:50507:55:05 9 发病率： 1/133 = 0.007519 7/79 = 0.088608 25/228 = 0.109649 12/72 = 0.166667