Table 2

SIR of thyroid cancer among first-degree relatives (n = 4282) of papillary thyroid cancer index cases by gender and age

Age groups (years)Person yearsNo. of casesSIR95% CI
Males
All age groups68,69365.82.1–12.6
0–4045,77014.00.1–22.5
41–5512,038313.52.8–39.3
56–707,96112.80.1–15.6
70+2,92514.80.1–26.9
Females
All age groups67,795124.12.1–7.1
0–4044,18933.00.6–8.9
41–5511,96544.81.3–12.4
56–708,21722.70.3–9.8
70+3,42437.31.5–21.4