Table 2 Quality assessment of eligible studies based on Newcastle-Ottawa scale.

From: Association between cadmium exposure and renal cancer risk: a meta-analysis of observational studies

Author

year

Selection

Comparability

Exposure

Kolonel LN

1976

1

1

2

Armstrong BG

1985

2

1

1

Partanen T

1991

2

1

2

McCredie M

1993

2

1

2

Mandel JS

1995

2

1

3

PeschB

2000

3

2

2

Hu J

2002

3

1

3

Boffetta P

2011

3

1

2

Garcia-Esqinas E

2014

3

2

2

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