Table 3. Quality assessment of included studies based on Newcastle-Ottawa scale.
Author | year | Selection | Comparability | Exposure |
---|---|---|---|---|
Simonen O | 1985 | 3 | 0 | 2 |
Sowers MF | 1991 | 3 | 1 | 2 |
Danielson C | 1992 | 3 | 1 | 3 |
Jacobsen SJ | 1992 | 2 | 1 | 2 |
Jacobsen SJ | 1993 | 3 | 1 | 1 |
Cauley JA | 1995 | 3 | 2 | 2 |
Karagas MR | 1996 | 3 | 0 | 2 |
Lehmann R | 1998 | 3 | 0 | 1 |
Kurttio P | 1999 | 4 | 1 | 3 |
Phipps KR | 2000 | 3 | 2 | 2 |
Hillier S | 2000 | 3 | 2 | 2 |
Li Y | 2001 | 3 | 2 | 1 |
Park EY | 2008 | 3 | 2 | 2 |
Näsman P | 2013 | 4 | 2 | 3 |