对这两组中二次肿瘤的累计发病率用乘积极限法进行比较。
The cumulative incidence of SPM in these two groups was compared using the Kaplan-Meier method.
在42个月的研究中，据研究者观察，包皮环切术组HIV感染累计发病率为2.6%，而对照组累积发病率为7.4%。
The cumulative incidence of HIV infection over 42 months among circumcised men was 2.6% as compared to 7.4% among controls, the researchers observed.
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