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Table 2 Newcastle-Ottawa Scale for quality assessment

From: Clinicopathological and prognostic significance of PD-L1 expression in colorectal cancer: a systematic review and meta-analysis

Author, year

Selection

Comparability

Outcome

Total score

Exposed cohort

Non-exposed cohort

Ascertainment of exposure

Outcome of interest

Control for factor

Assessment of outcome

Follow-up long enough

Adequacy of follow-up

Enkhbat, 2018 [15]

*

*

*

 

**

 

*

*

7

Masugi, 2016 [35]

*

*

*

 

**

 

*

*

7

Saigusa, 2016 [16]

*

*

*

 

**

 

*

*

7

Zhu, 2015 [36]

*

*

*

 

**

 

*

*

7

Liang, 2014 [17]

*

*

*

*

**

 

*

*

8

Droeser, 2014 [37]

*

*

*

 

**

 

*

*

7

Hamada, 2017 [20]

*

*

*

 

**

 

*

*

7

Lee, 2018 [18]

*

*

*

 

**

 

*

*

7

Li, 2016 [19]

*

*

*

 

**

 

*

*

7

Miller, 2017 [38]

*

*

*

 

**

 

*

*

7

  1. *The article scored one point in the project
  2. **The article scored two points in the project