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Table 4 Reasons for altered numbers of cases at different stages

From: Malignant ureteral obstruction: experience and comparative analysis of metallic versus ordinary polymer ureteral stents

Group 3 days after 6 months after 1 year after
MSG Death 0 1 4
Failure of normal follow-up 0 1 0
Failure of catheterization 1 / /
Failure of statistical time 0 2 /
Statistical cases 31 27 23
OPSG Death 0 2 3
Failure of normal follow-up 0 3 1
Failure of catheterization 2 1 1
Statistical cases 42 36 28