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Table 1 Quality criteria for eligible studies

From: The influence of polymorphic GSTM1 gene on the increased susceptibility of non-viral hepatic cirrhosis: evidence from observational studies

Quality parameters Score
2 1 0
Population sample > 100 50–100 < 50
Study design Case and control group were both selected from hospital Control groups were selected from normal residents Unknown
General informationa Complete Partial Inadequate
Matching of case group and control group > 3 factors 1–3 factors None
Detection methods Multiplex PCR PCR–RFLP Other methods
  1. aFamily history, medical history, life style habits and frequency of alcohol intake