TABLE 2.

Hazard ratios (HRs) and 95% confidence intervals (CIs) of incident thyroid cancer (TC) related to dietary habits in total population.

Dietary habit	Total population
	TC cases	Person-years	HR (95% CI) for Model 1	HR (95% CI) for Model 2
Meal frequency: 3 meals/day for ≥ 5 days/week
No	30	23,902	1.00	1.00
Yes	104	78,438	1.30 (0.86–1.96)	1.34 (0.88–2.03)
Meal duration ≥ 10 min
No	46	24,336	1.00	1.00
Yes	88	78,024	0.57 (0.40–0.82)	0.58 (0.41–0.83)
Meat and eggs ≥ 5 times/week
No meat or amount of meat ≥ the size of 2 ping-pong balls and ≥ 1 egg	113	86,435	1.00	1.00
Amount of meat < the size of 2 ping-pong balls and < 1 egg	16	12,783	0.94 (0.56–1.58)	0.96 (0.57–1.62)
Seafood ≥ 3 times/week
No	84	67,907	1.00	1.00
Yes	50	34,356	1.33 (0.94–1.89)	1.30 (0.91–1.85)
Tofu or soy milk ≥ 3 times/week
No	77	57,292	1.00	1.00
Yes	57	44,989	0.95 (0.67–1.34)	0.94 (0.66–1.32)
Vegetables, seaweed, mushrooms (except kimchi) every meal
No	60	50,896	1.00	1.00
Yes	74	51,407	1.21 (0.86–1.70)	1.21 (0.86–1.71)
Fruits ≥ 5 days/week
No	65	46,706	1.00	1.00
Yes	67	55,600	0.79 (0.56–1.11)	0.75 (0.53–1.07)
Milk or dairy products ≥ 5 days/week
No	97	63,878	1.00	1.00
Yes	35	38,275	0.58 (0.39–0.86)	0.58 (0.39–0.85)
≥ 3 side dishes (except soup or kimchi) at every meal
No	26	22,586	1.00	1.00
Yes	106	79,763	1.35 (0.88–2.08)	1.33 (0.87–2.06)
Taste salty when eating out
No	54	41,582	1.00	1.00
Yes	76	60,249	0.85 (0.60–1.21)	0.85 (0.60–1.22)
Tend to eat salty food
Yes	12	10,357	1.00	1.00
Neutral (Medium)	96	70,530	1.03 (0.56–1.88)	1.02 (0.56–1.86)
No	24	21,434	0.83 (0.42–1.67)	0.84 (0.42–1.69)
Grilled meat frequency
Never	90	58,004	1.00	1.00
Sometimes	38	36,621	0.70 (0.48–1.03)	0.71 (0.48–1.04)
Often	3	5,918	0.39 (0.12–1.22)	0.39 (0.12–1.23)
N/A (Not applicable)	1	1,615	0.41 (0.06–2.96)	0.44 (0.06–3.14)

Model 1 was adjusted for age and sex.

Model 2 was adjusted for age, sex, BMI, smoking status, household income, and occupation.