Multiple flow rate or high flow rate test program does not have any additional significance, moreover, it complicates the data and makes the well test interpretation more difficult.
多流量或大流量测试法没有更多的地质意义，只会使地质资料复杂化，增加解释难度。
Cox regression was used to screen out single and multiple risk factors. Cumulative survival rate was calculated by life table and Gehan score test.
单因素生存分析用寿命表法计算，以生存曲线描述生存率，并进行Gehan比分检验。
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