Table 2 Study quality assessment using an adapted version of the Newcastle-Ottawa scale.

From: Ethnic differences in prostate-specific antigen levels in men without prostate cancer: a systematic review

Source

Selection

Comparability

Outcome

Rating

i

ii

iii

iv

v

vi

vii

Crawford 2011 [17]

 

*

   

*

**

Poor

DeAntoni 1996 [18]

*

*

*

 

**

*

**

Good

Espaldon 2014 [19]

*

*

*

 

**

*

**

Good

Gray 2003 [29]

*

 

*

*

**

*

*

Good

Gray 2005 [30]

*

 

*

*

**

*

*

Good

Lacher 2006 [24]

*

*

*

*

**

*

**

Good

Lacher 2015 [21]

*

*

*

 

**

*

**

Good

Matti 2021 [28]

*

*

*

 

**

*

 

Poor

Rhodes 2012a [22]

*

    

*

**

Poor

Rhodes 2012b [23]

*

    

*

**

Poor

Saraiya 2005 [26]

*

*

*

 

**

*

**

Good

Sarma 2014 [27]

*

   

**

*

**

Poor

Weinrich 1988 [25]

*

*

  

**

*

 

Poor

  1. i: representativeness of cohort, ii: selection of cohorts, iii: assignment of ethnicity, iv: sample size v- comparability of ethnic groups, vi: ascertainment of blood tests, vii: statistical analysis. * 1 star, ** 2 stars.
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