Table 2 Thyroid cancer incidence relative risks (RR) of 95% confidence interval (CI) due to age period cohort Thyroid cancer incidence relative risks (RR) and 95% confidence interval (CI) by age period cohort 

 20–24

1.00

1.00

1.00

1.00

 25–29

1.67 (2.77,1.01)

1.52 (2.04,1.13)

1.46 (1.91,1.12)

1.41 (1.67,1.20)

 30–34

2.68 (5.43,1.32)

3.96 (6.84,2,30)

3.00 (4.83,1.87)

3.77 (5.34,2.66)

 35–39

3.02 (6.44,1.41)

3.64 (6.32,2.10)

4.52 (7.99,2.56)

4.98 (7.35,3.38)

 40–44

3.80 (8.87,1.63)

5.29 (10.01,2.80)

5.97 (11.25,3.17)

5.42 (8.17,3.59)

 45–49

5.45 (14.19,2.09)

3.91 (7.22,2.12)

9.71 (19.95,4.73)

7.96 (12.66,5.01)

 50–54

7.08 (19.76,2.53)

4.42 (8.44,2.32)

13.19 (28.73,6.06)

7.93 (12.84,4.90)

 55–59

8.29 (24.36,2.82)

4.40 (8.45.2.29)

14.89 (33.73,6.57)

9.10 (15.14,5.47)

 60–64

4.33 (11.53,1.63)

5.19 (10.30,2.62)

13.44 (30.94,5.84)

9.60 (16.24,5.68)

 65–69

4.65 (12.86,1.68)

5.70 (11.41,2.85)

14.71 (34.40,6.29)

9.14 (15.50,5.39)

 70–74

5.06 (14.43,1.78)

5.54 (10.94,2.80)

12.40 (28.48,5.40)

8.67 (14.63,5.13)

 75–79

12.58 (39.74,3.98)

5.44 (10.42,2.85)

13.04 (29.09,5.84)

7.68 (12.64,4.67)

 1992

1.00

1.00

1.00

1.00

 1997

1.15 (1.21,1.10)

1.10 (1.12,1.08)

1.30 (1.36,1.24)

1.23 (1.26,1.19)

 2002

1.40 (1.53,1.28)

1.11 (1.14,1.09)

1.54 (1.65,1.44)

1.51 (1.57,1.45)

 2007

2.00 (2.31,1.73)

1.23 (1.27,1.19)

1.66 (1.77,1.55)

1.68 (1.75,1.61)

 2012

3.28 (4.03,2.68)

1.56 (1.65,1.48)

1.89 (1.99,1.78)

1.83 (1.90,1.76)

 2017

3.81 (4.70,3.09)

1.90 (2.02,1.79)

2.13 (2.22,2.05)

1.95 (2.01,1.89)

 1913–1917

1.00

1.00

1.00

1.00

 1918–1922

0.99 (1.24,0.79)

0.90 (1.15,0.71)

0.93 (1.09,0.80)

0.94 (1.09,0.80)

 1923–1927

1.05 (1.56,0.71)

0.89 (1.27,0.62)

0.86 (1.10,0.68)

0.88 (1.11,0.71)

 1928–1932

1.09 (1.83,0.65)

0.92 (1.42,0.60)

0.81 (1.08,0.61)

0.85 (1.10,0.65)

 1933–1937

1.01 (1.89,0.53)

0.95 (1.54,0.59)

0.77 (1.05,0.56)

0.81 (1.09,0.61)

 1938–1942

0.80 (1.56,0.41)

0.91 (1.52,0.54)

0.71 (0.98,0.51)

0.77 (1.05,0.57)

 1943–1947

0.73 (1.25,0.43)

0.99 (1.63,0.60)

0.64 (0.86,0.48)

0.73 (0.97,0.55)

 1948–1952

0.81 (1.36,0.49)

1.10 (1.80,0.67)

0.58 (0.75,0.46)

0.67 (0.86,0.51)

 1953–1957

0.84 (1.38,0.52)

1.04 (1.65,0.66)

0.52 (0.64,0.43)

0.63 (0.80,0.50)

 1958–1962

0.80 (1.28,0.50)

0.94 (1.44,0.61)

0.47 (0.55,0.41)

0.59 (0.72,0.48)

 1963–1967

0.88 (1.36,0.57)

0.98 (1.49,0.65)

0.44 (0.48,0.40)

0.54 (0.65,0.46)

 1968–1972

0.79 (1.13,0.56)

0.84 (1.22,0.58)

0.40 (0.40,0.39)

0.48 (0.55,0.42)

 1973–1977

0.66 (0.81,0.53)

0.68 (0.92,0.51)

0.36 (0.34,0.39)

0.45 (0.49,0.42)

 1978–1982

0.62 (0.68,0.56)

0.61 (0.72,0.51)

0.36 (0.30,0.43)

0.45 (0.45,0.44)

 1983–1987

0.61 (0.58,0.64)

0.56 (0.58,0.54)

0.35 (0.24,0.51)

0.45 (0.41,0.49)

 1988–1992

0.55 (0.33,0.90)

0.42 (0.24,0.73)

0.31 (0.13,0.70)

0.42 (0.27,0.65)

 1993–1997

0.43 (0.05,4.00)

0.30 (0.04,2.43)

0.27 (0.03,2.09)

0.37 (0.11,1.29)

 AIC

3.19

3,91

4.48

4.92

 BIC

−170.03

− 169.73

−170.30

−170.68

 Deviance

1.04

1.34

0.77

0.39