Table 2. Cancer-specific mortality and all-cause mortality of TC, TC2BC, and BC2TC groups.

Group	Cancer-specific mortality					All-cause mortality
	Number	%	1,000 person-years	95% CI		Number	%	1,000 person-years	95% CI
TC	3,906	3.0	3.036	2.935–3.141		11,387	8.8	9.161	8.985–9.342
TC2BC	39	1.3	0.868	0.634–1.188		686	22.9	15.264	14.164–16.450
BC2TC	97	3.3	4.869	3.941–6.015		619	21.4	32.555	30.000–35.327

TC, thyroid cancer; BC, breast cancer; TC2BC, BC after TC; BC2TC, BC before TC; CI, confidence interval.