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Table 2 Result of the Newcastle-Ottawa scale quality assessment

From: Frailty as a predictor of mortality among patients with COVID-19: a systematic review and meta-analysis

Author/years

Selection (4)

Comparability

(2)

Outcome

(3)

Quality

(9)

Representativeness of the exposed cohort

Selection of the non-exposed cohort

Ascertainment of exposure

Demonstration that outcome of interest was not present at start of study

Comparability of cohorts on the basis of the design or analysis

Assessment of outcome

Was follow-up long enough for outcome to occur

Adequacy of follow up of cohorts

 

Kundi 2020 [18]

1

1

1

1

2

1

1

1

9

Hägg 2020 [12]

1

1

1

1

2

1

0

1

8

Aw 2020 [8]

1

1

1

1

2

1

0

1

8

Hewitt 2020 [17]

1

1

1

1

2

1

1

1

9

Shi 2020 [24]

1

1

1

1

2

1

0

1

8

Maguire 2020 [13]

1

1

1

1

1

1

0

1

7

Cobos-Siles 2020 [25] 

1

1

1

1

1

1

0

1

7

Steinmeyer 2020 [16]

1

1

1

1

0

1

0

1

6

Owen 2021 [15]

1

1

1

1

2

1

0

1

8

Fiorentino 2020 [11]

1

1

1

1

1

1

0

1

7

Chinnadurai 2020 [19]

1

1

1

1

2

1

0

1

8

Apea 2021 [22]

1

1

1

1

1

1

0

1

7

Bielza 2021 [21]

1

1

1

1

1

1

0

1

7

Mendes 2020 [23]

1

1

1

1

1

1

0

1

7

Tehrani 2021 [20]

1

1

1

1

1

1

0

1

7