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Table 3 Risk of bias assessment of the studies based on the Newcastle–Ottawa scale (NOS)

From: COVID-19 mortality in patients with immunodeficiency and its predictors: a systematic review

Study

Selection (Out of 4)

Comparability (Out of 2)

Exposure/outcome (Out of 3)

Total score (Out of 9)

Bhaskaran K [17]

4

2

3

9

Cabello A [18]

4

2

3

9

Childs K [28]

3

–

3

6

Cohen B[19]

4

–

3

7

Del Amo J [32]

4

–

3

7

Delavari S [24]

4

–

3

7

Fill L [25]

3

–

3

6

Gamboa E [38]

3

–

3

6

Geretti AM [39]

4

2

3

9

Gervasoni C [33]

4

–

3

7

Hadi YB [29]

4

2

3

9

Härter G [34]

4

–

3

7

Ho H-e [30]

4

2

3

9

Karmen-Tuohy S [27]

4

2

3

9

N.S.C. van Oers [23]

3

–

3

6

Douglas Tremblay [40]

4

–

3

7

K. Sigel [35]

4

2

3

9

A. M. Shields [21]

4

1

3

8

N. Shalev [36]

4

–

3

7

S. R. Nagarakanti [37]

4

2

3

9

H. Miyashita [31]

4

–

3

7

I. Meyts [26]

3

–

3

6