Details of studies on type 2 diabetes for thyroid cancer risk.

<p>NIH-AARP (National Institutes of Health-American Association of Retired Persons) study; USRT (United States Radiologic Technologists) study; PLCO (Prostate, lung, colorectal and Ovarian Cancer Screening Trial) study.</p>a<p>Study quality was judged based on the Newcastle-Ottawa Scale (range, 1–9 stars).</p>b<p>Standardized incidence ratio (SIR) per 1,000,000 within reference population.</p>c<p>Prostate, lung, colorectal and Ovarian Cancer Screening Trial (PLCO) data.</p>d<p>Participants who were classified into the highest quintile (quintile 5) were regarded as diabetic patients (including level for impaired fasting glucose metabolism).</p>e<p>Participants with Impaired Fasting Glucose (IFG, 100≤FBS or OGTT<125) or Impaired Glucose Tolerance (IGT, 140≤OGTT≤199) by 2009 ADA criteria.</p>f<p>Controls were benign thyroid diseases.