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Table 3 Newcastle-Ottawa Scale for assessing the quality of the included studies

From: Seminal plasma biomarkers for predicting successful sperm retrieval in patients with nonobstructive azoospermia: a narrative review of human studies

Authors

Is the case definition adequate?

Representativeness of the cases.

Selection of controls

Definition of controls

Comparability of cases and controls on the basis of the design or analysis

Ascertainment of exposure

Same method of ascertainment for cases and controls

Non-response

Rate

Total scores

Fénichel

et al. [11]

-

-

6

Nagata

et al. [12]

-

-

-

6

Mostafa

et al. [13]

-

7

Duvilla et al. [14]

-

-

6

Roshdy

et al. [15]

-

-

6

Sabetian et al. [16]

-

-

6

Mitchell

et al. [17]

-

7

Ma et al. [18]

-

8

Aslani et al. [19]

-

-

-

5

Freour

et al. [20]

-

-

6

Pansa

et al. [21]

-

-

-

5

Fukuda

et al. [22]

-

-

-

6

Korbakiset al. [23]

-

-

6

Gilany

et al. [24]

-

-

-

6

Gilany

et al. [25]

-

-

-

6

Barceló

et al. [26]

-

-

-

5

Hashemi

et al. [27]

-

7

Xie et al. [28]

-

-

7

Ji et al. [29]

-

8

Zhang

et al. [30]

-

-

6

Han et al. [31]

-

8