Table 2

The association between Mets, other factors and oral potentially malignant disorders (Mets → OPMD)

	RR	95% CI	aRR	95% CI
Metabolic syndrome
Yes vs no	1.42	1.22 to 1.66	1.33	1.14 to 1.55
Sex
Male vs female	7.14	3.94 to 12.94	3.49	1.89 to 6.44
Age groups (vs 70+)
30–39	2.89	1.85 to 4.52	2.17	1.35 to 3.47
40–49	3.53	2.43 to 5.12	2.63	1.79 to 3.85
50–59	3.63	2.52 to 5.24	3.1	2.14 to 4.49
60–69	2.85	1.95 to 4.16	2.53	1.73 to 3.71
Betel nut chewing (vs never)
Quit*	3.03	2.54 to 3.63	2	1.62 to 2.47
Current	4.92	4.10 to 5.89	2.68	2.16 to 3.33
Cigarette smoking (vs never)
Quit*	2.32	1.78 to 3.03	1.31	0.96 to 1.78
Current	4.9	3.94 to 6.09	2.47	1.90 to 3.20
Alcohol drinking (vs never)
Quit*	2.18	1.62 to 2.92	1.23	0.90 to 1.68
Current	1.95	1.65 to 2.30	1.03	0.86 to 1.23
Meat (vs seldom)
Infrequent	1.13	0.95 to 1.35	0.95	0.79 to 1.13
Frequent	1.77	1.30 to 2.41	1.23	0.90 to 1.68
Vegetable (vs seldom)
Infrequent	0.83	0.70 to 0.99	0.92	0.77 to 1.10
Frequent	0.36	0.15 to 0.87	0.46	0.19 to 1.11
Fruit (vs seldom)
Infrequent	0.74	0.59 to 0.93	0.91	0.72 to 1.15
Frequent	0.51	0.40 to 0.64	0.79	0.62 to 1.00
Education level (vs junior high school or lower)
Senior high school	1	0.84 to 1.19	0.97	0.80 to 1.17
University	0.6	0.45 to 0.81	0.84	0.62 to 1.14

*Quit: quit betel quid chewing, quit smoking or quit alcohol drinking defined as those who once participated in these oral habits but no longer participate in these habits on the day of interview.
aRR, adjusted rate ratio; Mets, metabolic syndrome; OPMD, oral potentially malignant disorder; RR, risk ratio.