Table 1.
Characteristics of cohort studies included in this meta-analysis
| First author | Year | Population | Cohort | No. of pts. | Person-years | Observed/Expected events for thyroid cancer |
|---|---|---|---|---|---|---|
| Bernatsky S | 2013 | Multi-centre | Multi centre clinical | 16409 | 121 283 years | 24/13.7 |
| Bjornadal L | 2002 | Swedish | Administrative data-based | 5715 | 50 246 years | 1/3.5 |
| Chen YJ | 2010 | Taiwan | National Health Insurance Research Database | 11763 | -- | 14/6.26 |
| Dreyer L | 2011 | Danish | Central Population Register | 576 | 7 803 years | 1/0.3 |
| Kang KY | 2010 | Korea | Kangnam St. Mary’s hospital | 914 | 5 716 years | 1/1.03 |
| Parikh-Patel A | 2008 | California | Statewide patient discharge data | 30478 | 157 969 years | 30/16.4 |
| Ragnarsson O | 2003 | Icelandic | Icelandic SLE database | 238 | 2 774 years | 1/0.58 |