Table 2

Odds ratios (ORs) and 95% confidence intervals (CIs) for stomach and oesophageal cancer by farming activity

	Controls	Stomach cancer			Oesophageal cancer
	Controls	Cases	OR*	95% CI	Cases	OR*	95% CI
*Odds ratio adjusted for age and gender.
†Reference category: non-farmers.
‡Subjects who lived or worked on a farm only before age 18.
§Subjects who had lived or worked on a farm as an adult (>18 years).
Non-farmers	184	59	1.0	Ref†	62	1.0	Ref†

Farmers
Only before age 18‡	97	23	0.7	0.4 to 1.2	19	0.6	0.3 to 1.1
Adult farmers§	221	88	0.9	0.6 to 1.3	56	0.7	0.5 to 1.2

Adult farmers
Years farmed
⩽24	73	18	0.7	0.4 to 1.2	19	0.8	0.4 to 1.4
25–54	70	31	1.0	0.6 to 1.7	18	0.8	0.4 to 1.6
⩾55	75	38	1.0	0.6 to 1.6	19	0.7	0.4 to 1.3
Average acres
<170	79	36	1.0	0.6 to 1.7	18	0.7	0.4 to 1.3
170–320	63	25	0.8	0.5 to 1.4	15	0.7	0.4 to 1.4
>320	54	18	0.8	0.4 to 1.6	12	0.6	0.3 to 1.2