Table 2. Relative risk (RR) of cancer of the small intestine with 95% confidence intervals (CI) obtained in Cox's regression analyses; age at measurement and birth cohort were included in the model in addition to either body mass index (BMI) or height.

	Cancer of the duodenum		Cancer of the small intestine
	RR	95% CI	RR	95% CI
Men	118 cases		571 cases
BMI (kg/m2)
<18.5	0.00	0.00-	1.53	0.57–4.11
18.5–24.9	1.00	Referent	1.00	Referent
25.0–29.9	1.18	0.80–1.72	1.22	1.03–1.45
⩾30.0	1.56	0.74–3.29	1.59	1.13–2.23
Test for trenda	P=0.1		P=0.02
Height (cm)
<160	1.03	0.14–7.50	0.45	0.11–1.83
160–169	0.99	0.60–1.61	0.99	0.79–1.25
170–179	1.00	Referent	1.00	Referent
⩾180	1.04	0.69–1.62	1.23	1.01–1.50
Test for trenda	P=0.7		P=0.01
Women	112 cases		591 cases
BMI (kg/m2)
<18.5	0.78	0.11–5.65	1.20	0.64–2.25
18.5–24.9	1.00	Referent	1.00	Referent
25.0–29.9	1.10	0.71–1.70	0.94	0.78–1.13
⩾30.0	1.67	1.00–2.80	0.98	0.76–1.26
Test for trenda	P=0.2		P=0.2
Height (cm)
<150	0.00	0.00-	0.82	0.42–1.61
150–159	0.94	0.62–1.44	0.91	0.75–1.09
160–169	1.00	Referent	1.00	Referent
⩾170	1.33	0.74–2.39	1.35	1.05–1.74
Test for trenda	P=0.4		P=0.01

^aBMI and height, respectively, were included as continuous variables.