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Table 5 Critical appraisal of selected studies. Modified scale from Dufault and Klar [29]

From: Mortality and morbidity in populations in the vicinity of coal mining: a systematic review

Author (year)

Study design and focus

Statistical methodology

Quality of reporting

Score

Sample size

Level of inference

Pre-specification of ecological units

Validity of statistical inferences

Use of covariates

Spatial effects

Proper adjustment for covariates

Statement of study design

Justification of study design

Discussion of cross-level bias and limitations

Points

Liao et al. (2016)

2

1

1

0

0

1

0

1

1

0

7

Woolley et al. (2015)

2

1

0

0

0

0

0

1

0

1

5

Talbott et al. (2015)

2

1

0

2

1

1

0

1

0

1

9

Mueller et al. (2015)

2

1

0

2

1

1

0

1

1

1

10

Lamm et al. (2015)

2

1

0

2

0

0

0

0

0

0

5

Buchanich et al. (2014)

1

1

0

2

1

0

1

0

0

1

7

Brink et al. (2014)

2

1

0

2

1

0

0

1

0

0

7

Liu et al. (2013)

2

1

0

2

1

0

1

0

1

0

8

Fernandez-Navarro et al. (2012)

2

1

0

2

1

1

0

1

0

1

9

Ahern and Hendryx (2012)

2

1

0

2

1

0

0

1

1

0

8

Borak et al. (2012)

2

1

0

2

1

0

0

0

0

0

6

Ahern et al. (2011)

2

1

0

2

1

1

1

1

1

1

11

Esch and Hendryx (2011)

2

1

0

2

1

0

0

1

1

1

9

Christian et al. (2011)

2

1

0

2

1

1

0

0

1

0

8

Hendryx (2011)

2

1

0

2

1

0

0

0

0

1

7

Ahern, MacKay and Hamilton (2011)

2

1

0

2

1

0

1

0

0

0

7

Liao et al. (2010)

2

1

1

2

1

1

0

1

1

0

10

Hendryx et al. (2010a)

2

1

0

2

1

1

0

1

0

1

9

Hendryx, Fedorko and Halverson (2010)

2

1

0

2

1

0

0

1

0

0

7

Hitt and Hendryx (2010)

2

1

0

0

0

1

0

0

0

1

5

Hendryx (2009)

2

1

0

2

1

0

0

0

0

1

7

Hendryx and Ahern (2009)

2

1

0

2

1

0

0

0

0

0

6

Hendryx (2008)

2

1

0

2

1

0

0

1

0

0

7

Hendryx et al. (2008)

2

1

0

2

1

0

0

0

0

0

6

Hendryx et al. (2007)

2

1

0

2

1

0

1

1

0

1

9

Gu et al. (2007)

2

1

0

0

1

1

0

0

1

0

6

Howel et al. (2001)

2

1

0

2

1

0

1

0

0

0

7

Pless-Mulloli et al. (2000)

2

1

0

2

1

0

1

0

0

0

7