Table 1 Main characteristics of the included studies in our-analysis
From: Does hypothyroidism increase the risk of breast cancer: evidence from a meta-analysis
Study | Year | Region | Sample | Median/Mean age | Follow-up | Study design | NOS |
|---|---|---|---|---|---|---|---|
(years) | (years) | ||||||
Adami | 1978 | Sweden | 358 | 64 | 1 | Case-control | 7 |
Kalache | 1982 | UK | 2352 | NA | 11 | Case-control | 6 |
Hoffman | 1984 | Sweden | 1665 | 47.2 | 21.9 | Cohort | 8 |
Brinton | 1984 | USA | 2612 | NA | 4 | Case-control | 7 |
Moseson | 1993 | Canada | 1101 | 54 | 4 | Case-control | 7 |
Smyth | 1996 | Ireland | 400 | 57.2 ± 1.4 | 1 | Case-control | 7 |
Shering | 1996 | Ireland | 350 | NA | NA | Case-control | 7 |
Talamini | 1997 | Italy | 5157 | 55 | 3 | Case-control | 7 |
Simon | 2002 | USA | 9257 | NA | 4 | Case-control | 6 |
Turken | 2003 | Prague | 250 | 63 | 4 | Case-control | 6 |
Kuijpens | 2005 | Netherlands | 2775 | 50.5 | 9 | Cohort | 8 |
Cristofanilli | 2005 | USA | 2224 | 51.6 ± 12.6 | 3 | Case-control | 6 |
Sandhu | 2009 | Canada | 179,462 | 74.9 ± 7 | 10 | Cohort | 8 |
Hellevik | 2009 | Norwegian | 29,691 | ≥20 | 9 | Cohort | 7 |
Ditsch | 2010 | Germany | 130 | 58.6 ± 13.5 | NA | Case-control | 7 |
Grani | 2012 | Italy | 380 | 59 | 5 | Case-control | 7 |
Søgaard | 2016 | Danish | 61,873 | 71 | 35 | Cohort | 7 |
Weng | 2018 | USA | 103,466 | 53.3 | NA | Case-control | 8 |
Kim | 2019 | Korea | 67,416 | ≥40 | 4 | Cohort | 8 |