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Table 2 Assessment of study quality

From: Association between periodontal disease and mortality in people with CKD: a meta-analysis of cohort studies

Study year

Quality indicators from the Newcastle-Ottawa scale

Score

Selection

Comparable

Outcome assessment

1

2

3

4

5

6

7

8

9

Blach (26) 2009

*

*

*

*

   

*

*

6

Kshirsagar (15) 2009

*

*

*

*

*

*

*

 

*

8

Chen (16) 2011

*

*

*

*

 

*

*

*

*

8

Souza (24) 2014

*

*

*

*

 

*

*

*

*

8

Palmer (28) 2015

*

*

*

*

  

*

  

5

Ricardo (14) 2015

*

*

*

*

  

*

*

*

7

Chen (27) 2015

 

*

*

*

 

*

*

 

*

6

Ruokonen (25) 2016

*

*

*

*

 

*

*

*

*

8

  1. Footnote: For cohort studies, 1 indicates exposed cohort truly representative; 2, non-exposed cohort drawn from the same community; 3, ascertainment of exposure; 4, outcome of interest not present at start; 5, cohorts comparable on basis of age; 6, cohorts comparable on other factor(s); 7, quality of outcome assessment; 8, follow-up long enough for outcomes to occur; and 9, complete accounting for cohorts. Each asterisk represents one star in the Newcastle-Ottawa scale system. The maximum number of stars is 2 for comparability and 1 for each of the other categories, for a total of up to 10 stars