Table 3.

Factors related to GC risk- results of conditional logistic analysis

	Case	Control	OR	(95% CI)	P
Birth order 1					0.1232
1	49	125	1	(referent)
2-3	80	152	1.3	(0.8-2.0)
4+	85	151	1.4	(0.9-2.2)
Salting meals before tasting					0.001
No	197	420	1	(referent)
Yes	19	11	3.5	(1.6-7.3)
Frequent fruits intake					0.046
No	7	4	1	(referent)
Yes	209	127	0.3	(0.1-1.0)
Frequent vegetable intake					0.041
No	8	5	1	(referent)
Yes	208	426	0.3	(0.1-1.0)
Steaming foods					0.782
No	172	347	1	(referent)
Yes	44	84	1.1	(0.7-1.6)
Frying foods					0.039
No	13	49	1	(referent)
Yes	203	382	1.9	(1.0-3.6)
Smoking foods					0.161
No	160	341	1	(referent)
Yes	56	90	1.3	(0.9-1.9)
Cooking with oven					0.105
No	158	289	1	(referent)
Yes	58	142	0.7	(0.5-1.1)
Cooking with coal					< 0.001
No	100	264	1	(referent)
Yes	116	167	1.8	(1.3-2.6)
Roasting foods					0.243
No	74	166	1	(referent)
Yes	142	265	1.2	(0.9-1.8)
Cigarette smoking					0.2312
			P for heterogeneity = 0.098
Never	78	188	1	(referent)
Ex-smoker	89	145	1.5	(1.0-2.3)
Current smoker	49	98	1.2	(0.8-1.9)
Cigarettes smoked per day					0.323 2
(ex-smoker and current smokers combined)			P for heterogeneity = 0.079
Never	78	188		(referent)
1-14	93	145	1.6	(1.1-2.3)
15-24	33	79	1	(0.6-1.7)
25+	12	19	1.6	(0.7-3.6)
Cigarette smoking (men only)					0.7312
			P for heterogeneity = 0.160
Never	36	88	1	(referent)
Ex-smoker	65	104	1.6	(1.0-2.6)
Current smoker	35	79	1.1	(0.6-1.9)

¹Information on birth order was missing in 2 cases and 3 controls;

²P for trend.