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Table 2 The Newcastle-Ottawa quality assessment scale of including studies

From: Association of preadmission metformin use and mortality in patients with sepsis and diabetes mellitus: a systematic review and meta-analysis of cohort studies

Studies

Selection

Comparability

Assessment of outcome

Total quality score

First author

Representativeness of exposure arm(s)

Selection of the comparative arm(s)

Origin of exposure source

Demonstration that outcome of interest was not present at start of study

Studies controlling the most important factors

Studies controlling the other main factors

Assessment of outcome with independency

Adequacy of follow-up length (to assess outcome)

Lost to follow-up acceptable (less than 10% and reported)

Doenyas-Bara [19]

*

*

*

*

*

*

*

*

 

8

Green [21]

*

*

*

*

*

*

*

*

 

8

Jochmans [20]

*

*

*

*

*

*

*

*

 

8

Park [22]

*

*

*

*

*

*

*

*

 

8

van Vught [23]

*

*

*

*

*

–

*

*

 

7