Table 3.

Incidence rate. Follow-up duration of samples ≧ 3 months

Variable	Total	Event (%)	Total person-years	Incidence rate (/10⁵ years)	IRR (95%CI)	p value	Log-rank p	Proportional hazards assumption
Before PSM (1:20 age, sex matching)
Scenario 1
Non-Hashimoto’s thyroiditis	310,704	241 (0.08)	1,512,207	15.94	Ref.		< 0.001	0.478
Hashimoto’s thyroiditis	15,725	76 (0.48)	73,789	103.00	6.46 (4.99–8.36)	< 0.001
Scenario 2
Non-Hashimoto’s thyroiditis	310,704	237 (0.08)	1,512,219	15.67	Ref.		< 0.001	0.510
Hashimoto’s thyroiditis	15,726	76 (0.48)	73,791	102.99	6.57 (5.08–8.51)	< 0.001
Scenario 3
Non-Hashimoto’s thyroiditis	310,709	186 (0.06)	1,512,452	12.30	Ref.		< 0.001	0.202
Hashimoto’s thyroiditis	15,730	66 (0.42)	73,832	89.39	7.27 (5.49–9.63)	< 0.001
Scenario 4
Non-Hashimoto’s thyroiditis	309,068	214 (0.07)	1,504,399	14.22	Ref.		< 0.001	0.125
Hashimoto’s thyroiditis	15,180	54 (0.36)	71,560	75.46	5.30 (3.94–7.15)	< 0.001
1:2 PSM
Scenario 1
Non-Hashimoto’s thyroiditis	30,680	38 (0.12)	149,198	25.47	Ref.		< 0.001	0.810
Hashimoto’s thyroiditis	15,490	64 (0.41)	72,891	87.80	3.45 (2.31–5.15)	< 0.001
Scenario 2
Non-Hashimoto’s thyroiditis	30,680	36 (0.12)	149,206	24.13	Ref.		< 0.001	0.910
Hashimoto’s thyroiditis	15,490	64 (0.41)	72,891	87.80	3.64 (2.42–5.47)	< 0.001
Scenario 3
Non-Hashimoto’s thyroiditis	30,680	21 (0.07)	149,246	14.07	Ref.		< 0.001	0.246
Hashimoto’s thyroiditis	15,493	56 (0.36)	72,923	76.79	5.46 (3.31–9.01)	< 0.001
Scenario 4
Non-Hashimoto’s thyroiditis	30,159	27 (0.09)	146,778	18.40	Ref.		< 0.001	0.603
Hashimoto’s thyroiditis	15,160	53 (0.35)	71,493	74.13	4.03 (2.54–6.41)	< 0.001