Table 2.

Association of metabolic syndrome or its components with the risk of thyroid cancer in male participants.

Characteristics	Number of Subjects	Number of Subjects with Thyroid Cancer	Incidence Per 10,000 Person-Years	RR (95% CI) *	p Value
Metabolic syndrome					<0.001
No	1,855,184	7986	5.2	Reference
Yes	613,812	3182	6.2	1.19 (1.14–1.24)
Metabolic syndrome components
Abdominal obesity					<0.001
No	1,987,144	8380	5.1	Reference
Yes	481,852	2788	6.9	1.34 (1.29–1.40)
Elevated blood pressure					<0.001
No	1,177,665	4922	4.6	Reference
Yes	1,291,331	6246	6.4	1.17 (1.13–1.22)
Hyperglycaemia					0.723
No	1,465,193	6644	5.4	Reference
Yes	1,003,803	4524	5.4	0.99 (0.96–1.03)
Hypertriglyceridemia					0.211
No	1,443,475	6422	5.3	Reference
Yes	1,025,521	4746	5.5	1.02 (0.99–1.06)
Low HDL-cholesterol					<0.001
No	2,170,410	9499	5.2	Reference
Yes	298,586	1669	6.7	1.27 (1.21–1.34)

RR, relative risk; CI, confidence interval; HDL, high-density lipoprotein. * Adjusted for age and body mass index.