Table 4. Reproducibility of selected food items between the first and second food frequency questionnaires.

Food item	All (n = 243)				< 3 years apart (n = 139)
	Spearman's correlation	Quartile agreement			Spearman's correlation	Quartile agreement
		Same	Same or adjacent	Opposite		Same	Same or adjacent	Opposite
Cooked rice	0.25	35	69	8	0.33	42	76	6
Cooked rice with other grains and legumes	0.51	43	80	6	0.52	45	82	6
Instant noodles, instant cup noodles	0.45	42	82	4	0.47	42	84	5
Loaf bread	0.45	43	79	7	0.47	49	81	9
Butter, margarine	0.36	-	-	-	0.46	-	-	-
Jam	0.49	-	-	-	0.55	-	-	-
Sweet red-beans buns, steamed sweet red-bean buns, cream buns	0.41	-	-	-	0.47	-	-	-
Pizza	0.36	33	76	7	0.46	37	79	6
Hamburger, sandwich	0.35	37	74	8	0.47	42	79	6
Plain steamed rice-cake, steamed rice-cake with red-bean, cubed rice-cake with soybean powder, plain cubed rice-cake	0.49	-	-	-	0.53	-	-	-
Cereal	0.36	-	-	-	0.41	-	-	-
Sea mustard soup	0.44	41	83	2	0.39	40	81	2
Bean paste soup	0.33	40	71	5	0.34	42	74	4
Kimchi stew, stir-fried kimchi	0.33	39	77	8	0.24	42	74	9
Bean curd, bean curd boiled in soy sauce, pan-fried bean curd	0.43	37	77	6	0.44	40	78	4
Soybean boiled in soy sauce	0.41	-	-	-	0.37	-	-	-
Fried egg, fried egg roll	0.41	39	79	3	0.44	41	81	4
Grilled pork belly	0.50	40	81	4	0.60	41	83	2
Stir-fried beef	0.45	37	77	3	0.52	35	80	5
Ham	0.43	39	78	8	0.48	40	78	8
Fried chicken	0.53	44	86	2	0.53	47	83	1
Anchovy, stir-fried anchovy	0.41	45	78	6	0.38	39	77	6
Bean sprout (seasoned, soup), seasoned mung bean sprout	0.40	33	78	7	0.45	42	81	5
Cucumber (seasoned, raw)	0.35	38	77	6	0.45	40	81	4
Vegetables salad	0.39	37	77	7	0.38	40	77	6
Boiled broccoli, boiled cabbage	0.46	45	73	7	0.54	50	78	7
Korean cabbage kimchi	0.46	42	79	4	0.51	48	84	8
Pickled vegetable (pepper, garlic, sesame leaf, onion, radish), pickled cucumber	0.37	46	74	10	0.36	40	72	10
Grilled laver, raw laver, seasoned laver	0.34	40	72	7	0.34	35	76	6
Stir-fried potatoes, potatoes boiled with soy sauce	0.45	39	81	5	0.45	42	76	5
Milk (normal)	0.31	-	-	-	0.26	-	-	-
Soybean milk	0.38	-	-	-	0.36	-	-	-
Tomato, cherry tomato	0.36	-	-	-	0.42	-	-	-
Apple	0.38	42	70	7	0.41	41	76	7
Banana	0.34	35	79	7	0.41	36	78	5
Coffee	0.54	46	83	5	0.54	46	83	5
Soft drink (cola, soda, fruit juice soda)	0.51	44	76	5	0.51	47	80	4
Snack	0.47	41	79	4	0.42	43	79	5
Cookie, cracker	0.36	33	80	7	0.40	42	77	9
Beer	0.72	58	86	2	0.74	60	87	2

Correlation coefficients were statistically significant at α = 0.05, unless otherwise noted as “^*”.