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。
2
Cox regression was used to screen out single and multiple risk factors. Cumulative survival rate was calculated by life table and Gehan score test.