Table 1.

Single conditional logistic regression analysis on dietary factors, n (%)

Factor	Frequency*	Cases	Control	P value	OR	95% CI
Breakfast consumption	+	112 (62.22)	153 (85.00)		1.00
	++	38 (21.11)	18 (10.00)	<0.01	2.84	1.54–5.25
	+++	30 (16.67)	9 (5.00)	<0.01	4.78	2.10–10.87
Meal duration	≥20 min	24 (13.33)	46 (25.56)		1.00
	10–20 min	50 (27.78)	70 (38.89)	0.393	1.32	0.70–2.52
	<20 min	106 (58.89)	64 (35.56)	<0.01	2.97	1.63–5.40
Onion or garlic	+	73 (40.56)	49 (27.22)		1.00
	++	66 (36.67)	56 (31.11)	0.29	0.74	0.42–1.30
	+++	41 (22.78)	75 (41.67)	<0.01	0.36	0.21–0.63
Spicy food	+	104 (57.78)	125 (69.44)		1.00
	++	45 (25.00)	48 (26.67)	0.71	1.11	0.64–1.93
	+++	31 (17.22)	7 (3.89)	<0.01	5.95	2.28–15.53
Hot food	+	76 (42.22)	114 (63.33)		1.00
	++	47 (26.11)	47 (26.11)	0.25	1.35	0.81–2.27
	+++	57 (31.67)	19 (10.56)	<0.01	5.63	2.72–11.66
Green vegetables	+	35 (19.44)	15 (8.33)		1.00
	++	70 (388.9)	46 (25.56)	0.34	0.71	0.36–1.43
	+++	75 (41.67)	119 (66.11)	<0.01	0.29	0.15–0.56
Fresh fruit	+	115 (63.89)	43 (23.89)		1.00
	++	42 (23.33)	78 (43.33)	<0.01	0.20	0.11–0.37
	+++	23 (12.78)	59 (32.78)	<0.01	0.16	0.08–0.32
Dairy	+	133 (73.89)	82 (45.56)		1.00
	++	32 (17.78)	53 (29.44)	<0.01	0.28	0.15–0.53
	+++	15 (8.33)	45 (25.00)	<0.01	0.17	0.08–0.36
Pickled vegetables	+	55 (30.56)	125 (69.44)		1.00
	++	65 (36.11)	45 (25.00)	<0.01	2.67	1.60–4.49
	+++	60 (33.33)	10 (5.56)	<0.01	15.27	5.91–39.49
Fish sauce	+	109 (60.56)	135 (75.00)		1.00
	++	30 (16.67)	32 (17.78)	0.96	1.02	0.56–1.83
	+++	41 (22.78)	13 (7.22)	<0.01	3.81	1.89–7.65

*‘+’, never or seldom consuming; ‘++’, sometimes consuming; ‘+++’, regularly consuming.