Table 2.

Crude and adjusted odds ratios (and 95 % confidence intervals) of oesophageal cancer risk for soya consumption and isoflavone intakes among adults in Xinjiang Province, China, January 2008–December 2009

	Cases		Controls
Daily intake	n	%	n	%	Crude OR	95 % CI	Adjusted OR*	95 % CI	P for trend*†
Total soya foods (g/d)									0·001
<26·0	182	50·7	122	32·1	1·00	Ref.	1·00	Ref.
26·0−97·0	115	32·0	132	34·7	0·58	0·42, 0·82	0·53	0·37, 0·76
>97·0	62	17·3	126	33·2	0·33	0·23, 0·48	0·33	0·22, 0·49
Soya milk (ml/d)									0·001
<2·0	256	71·3	211	55·5	1·00	Ref.	1·00	Ref.
2·0−60·0	61	17·0	92	24·2	0·55	0·38, 0·79	0·58	0·40, 0·86
>60·0	42	11·7	77	20·3	0·45	0·30, 0·68	0·48	0·31, 0·73
Isoflavones (mg/d)									<0·001
<8·0	194	54·0	126	33·2	1·00	Ref.	1·00	Ref.
8·0−26·0	92	25·6	126	33·2	0·47	0·33, 0·67	0·46	0·32, 0·66
>26·0	73	20·3	128	33·7	0·37	0·26, 0·53	0·37	0·25, 0·55
Daidzein (mg/d)									0·001
<3·6	192	53·5	126	33·2	1·00	Ref.	1·00	Ref.
3·6−11·7	95	26·5	127	33·4	0·49	0·35, 0·70	0·47	0·33, 0·68
>11·7	72	20·1	127	33·4	0·37	0·26, 0·54	0·38	0·26, 0·57
Genistein (mg/d)									<0·001
<4·0	194	54·0	126	33·2	1·00	Ref.	1·00	Ref.
4·0−13·0	93	25·9	125	32·9	0·48	0·34, 0·69	0·46	0·32, 0·67
>13·0	72	20·1	129	33·9	0·36	0·25, 0·52	0·36	0·25, 0·54
Glycitein (mg/d)									<0·001
<0·4	204	56·8	144	37·9	1·00	Ref.	1·00	Ref.
0·4−1·1	79	22·0	107	28·2	0·52	0·36, 0·75	0·52	0·35, 0·76
>1·1	76	21·2	129	33·9	0·42	0·29, 0·59	0·43	0·29, 0·62

Ref., reference category.

*From separate logistic regression models adjusting for age (years), gender, education level (none/primary, secondary, tertiary), BMI (5 years ago, kg/m²), total energy intake (kJ/d), tobacco smoking (pack-years), alcohol drinking (ml/week) and family history of cancer in first-degree relatives (no, yes).

†Treating exposures as continuous variables.