Table 1.

Observed and fitted cases of thyroid cancer incidence in the LSS (1958–2005) by categories of dose and other variables

	Age at exposure < 20 years							Age at exposure >= 20 years
	n	Case	Rate1	Fitted values				n	Case	Rate1	Fitted values
				Background	Fitted excess	AF2 (%)	95%CI				Background	Fitted excess	AF2 (%)	95%CI
Total
	45,738	191	12.2	153.5	41.1	36*	(22–46)	59,663	180	12.5	173.2	3.3	4*	(1–17)
Sex
Male	21,571	40	5.6	33.7	5.6	14	(0–27)	21,319	21	5.0	21.6	0.2	1	(0–6)
Female	24,167	151	17.5	119.7	35.5	23	(13–32)	38,344	159	15.5	151.6	3.1	2	(0–9)
Weighted thyroid dose (Gy)
NIC	10,867	33	8.6	26.6	0.0	0	(0–0)	14,377	25	6.9	31.4	0.0	0	(0–0)
0–0.005	15,243	45	8.8	53.9	0.1	0	(0–0)	19,071	61	13.4	57.7	0.0	0	(0–0)
0.005–0.1	12,143	37	8.8	39.6	2.7	6	(3–9)	15,485	50	13.5	46.3	0.2	0	(0–2)
0.1–0.25	2,981	20	19.1	10.9	3.8	26	(14–35)	4,308	17	16.4	14.2	0.3	2	(0–11)
0.25–0.5	1,798	15	24.0	7.5	5.3	41	(25–53)	2,695	11	17.1	9.2	0.4	4	(1–22)
0.5–1	1,405	15	31.8	7.6	9.0	54	(38–66)	2,111	8	16.0	8.0	0.7	9	(2–35)
1+	1,301	26	63.5	7.3	20.1	73	(59–83)	1,616	8	21.8	6.4	1.7	21	(6–59)
Attained age (year)
–39		38	5.9	24.9	13.4	35	(13–52)		3	7.8	2.6	0.3	9	(2–31)
40–49		34	10.2	26.3	8.6	25	(14–33)		15	9.2	13.2	0.6	5	(1–18)
50–59		53	16.8	41.3	10.4	20	(10–28)		29	9.5	29.6	0.7	2	(0–12)
60–69		45	21.0	42.2	6.9	14	(6–22)		44	11.2	45.0	0.7	2	(0–8)
70–		21	30.3	18.8	1.8	9	(3–17)		89	16.4	82.7	0.9	1	(0–6)
Calendar year
1958–1965	45,7383	22	7.1	11.2	5.7	34	(8–58)	59,6633	45	10.8	41.9	0.7	2	(0–10)
1966–1975	45,042	17	4.8	17.0	6.6	28	(12–42)	50,421	40	9.5	40.7	0.7	2	(0–9)
1976–1985	43,890	31	9.3	26.0	7.9	23	(13–32)	38,379	30	9.9	36.1	0.7	2	(0–8)
1986–1995	41,971	57	18.4	40.0	9.6	19	(10–27)	26,396	44	22.6	31.1	0.7	2	(0–8)
1996–2005	38,181	64	23.6	59.3	11.1	16	(6–24)	15,416	21	20.3	23.4	0.5	2	(0–8)

¹Cases per 100,000 person-years.

²Attributable faction (*among people with dose > 0.005 Gy weighted thyroid dose).

³The number of subjects at risk at the beginning of the period.

NIC: subjects who were not in the cities at the time of bombings.