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Table 2 Methodological quality assessment using the Newcastle-Ottawa Quality Assessment Scale for cohort studies

From: Smoking as a predictor of frailty: a systematic review

Author

Selection 1

Selection 2

Selection 3

Selection 4

Comparability 1

Comparability 2

Outcome 1

Outcome 2

Outcome 3

Total

Woods et al., 2005 [18]

1

1

0

1

0

0

1

1

0

5/9

Ottenbacher et al., 2009 [17]

1

1

0

n/a

1

1

1

1

0

6/8

Wang et al., 2013 [23]

1

1

0

n/a

1

1

1

1

0

6/8

Lee et al., 2014 [24]

1

1

0

n/a

1

0

1

1

0

5/8

Etman et al., 2015 [25]

1

1

0

n/a

1

1

1

1

0

6/8

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BMC Geriatrics

ISSN: 1471-2318

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