Table 3 Quality Assessment of Reviewed Cohort Studies.

From: Parity and endometrial cancer risk: a meta-analysis of epidemiological studies

Study

Exposed cohort represents average in community

Selection of the non-exposed cohort from same community

Ascertain exposure through records or structured interviews

Demonstrate that outcome not present at study start

Exposed and non-exposed matched and/or adjusted by factors

Ascertain outcome via independent blind assessment or record linkage

Follow-up long enough for outcome to occur

Loss to follow-up<20%

Overall Score

Dossus, 2010

1

1

0

1

2

1

1

1

8

Wernli, 2006

1

1

1

0

1

1

1

1

7

Hinkula, 2002

1

1

1

0

2

1

1

1

8

Terry, 1999

1

1

0

1

2

1

1

1

8

Albrektsen, 1995

1

1

1

0

2

1

1

1

8

Kvale, 1988

1

1

1

0

2

1

1

1

8

PLCO, US

1

1

0

1

2

1

1

1

8

USRT, US

0

1

0

1

2

1

1

1

7

de Warrd, 1996

1

1

0

0

0

1

1

1

5

Bevier, 2011

1

1

1

0

2

1

1

1

8

  1. 1 means study adequately fulfilled a quality criterion, 0 means it did not. Quality scale does not imply that items are of equal relevant importance.