Table 1

SIR of thyroid cancer among first-degree relatives (n = 5673) of thyroid cancer index cases by gender and histological type of index case

Histological typePerson yearsNo. of casesSIR95% CI
Males
All histological types90,785117.94.0–14.2
Papillary68,69365.82.1–12.6
Follicular10,325000.0–23.1
Medullary3,196489.924.5–230.3
Other types8,57116.70.2–37.6
Females
All histological types90,710266.54.2–9.5
Papillary67,795124.12.1–7.1
Follicular10,81024.30.5–15.4
Medullary3,542744.918.0–92.4
Other types8,563512.03.9–28.1