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. 2015 May 28;10(5):e0126488. doi: 10.1371/journal.pone.0126488

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