Mortality Rates In Each Treatment Cohort.

Overall χ2 test value for 2×4 contingency table = 9.6; p = 0.02.*p = 0.008 relative to vehicle.针对2×4列联表的整体卡方检验（χ2 test）值为9.6，p值为0.02；*相较于vehicle组，p值为0.008。