Table 1 Baseline characteristics of included studies in different populations.
Author | Year | Country/Area | Study design | Number of case, source | Number of control, source | Tumor identification | Adjustment | OI | SQ | Ethnicity |
|---|---|---|---|---|---|---|---|---|---|---|
Elbaz | 2002 | USA | Case-control | 196, Rochester Epidemiology Project | 196, general population | Before | Age, sex | OR | 7 | Western population |
Guttman | 2004 | Canada | Cohort | 15306, OHIP, ODB RPDB | 30612, general population | After | Age, sex | RR | 6 | Western population |
Powers | 2006 | USA | Case-control | 352, clinics of Group Health Cooperative | 484, enrollees of Group Health Cooperative | Before | Age, sex, year of enrollment, geographical location. | OR | 6 | Western population |
Driver | 2007 | USA | Cohort | 572, Physician’s Health Study | 487, Physician’s Health Study | After | Age | RR | 6 | Western population |
Fois | 2010 | UK | Cohort | 4355, UK National Health Service hospitals | NR, UK National Health Service hospitals | Before/after | Age, sex, calendar year of first recorded admission | RR | 7 | Western population |
Lo | 2010 | USA | Cohort | 692, Kaiser Permanente Northern California Medical Care Plan | 761, Kaiser Permanente Northern California Medical Care Plan | Before/after | Age, sex, cigarette smoking, alcohol consumption, body mass index | RR | 7 | Western population |
Becker | 2010 | UK | Cohort | 2993, UK-based General Practice Research Database | 3003, UK-based General Practice Research Database | After | Age, sex, general practice, diagnosis date, years of history | IRR | 6 | Western population |
Rugbjerg | 2012 | Denmark | Cohort | 20343 Danish Hospital Register | NR, general population | After | Age, sex, calendar period | SIR | 7 | Western population |
Wirdefeldt | 2013 | Sweden | Cohort | 11786, Swedish Patient Register | 58930, Swedish Patient Register | Before/after | Age. sex | HR | 7 | Western population |
Ong | 2014 | UK | Cohort | 219194, English national Hospital Episode Statistics | 9015614, English national Hospital Episode Statistics | After | Age, sex, calendar year, region of residence, quintile of patients | RR | 8 | Western population |
Lin | 2015 | Taiwan | Cohort | 62023, National Health Insurance | 124046, National Health Insurance | After | Age, sex | HR | 7 | Asian population |
Peretz | 2016 | Israel | Cohort | 7125, Maccabi Health Services | NR, Maccabi Health Services | After | Age, sex, chronological year | SIR | 7 | Western population |
Tacik | 2016 | USA | Case-control | 971, Mayo Clinic | 478, Mayo Clinic | Before | Age, sex | OR | 5 | Western population |
Freedman | 2016 | USA | Case-control | NR, SEER-Medicare | NR, SEER-Medicare | After | Age, sex, selection year | OR | 5 | Western population |
Jespersen | 2016 | Denmark | Case-control | 245, Danish Civil Registration System | 1656, Danish Civil Registration System | After | Age, sex. index date | OR | 7 | Western population |
