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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