Table 3. Odds ratios for risk of solid tumours by age and diagnostic group in relation to population mixing at ward and county district level.

		County district level			Ward level
Diagnostic group	Population mixing based on	OR	95% Cl	P	OR	95% Cl	P
(A) Age 0–14 years
All solid tumours	Incomers from outside the region	0.88	(0.79–0.98)	0.03	0.84	(0.75–0.94)	0.003
	All migrants	1.02	(0.91–1.14)	0.75	0.92	(0.82–1.03)	0.15
Hodgkin's disease	Incomers from outside the region	0.60	(0.39–0.92)	0.02	0.57	(0.37–0.88)	0.01
	All migrants	0.94	(0.62–1.44)	0.79	0.76	(0.50–1.16)	0.20
Brain and spinal tumours	Incomers from outside the region	0.87	(0.73–1.04)	0.12	0.79	(0.66–0.95)	0.01
	All migrants	0.98	(0.82–1.17)	0.83	0.85	(0.71–1.02)	0.08
Other solid tumoursa	Incomers from outside the region	0.98	(0.82–1.17)	0.85	0.97	(0.81–1.15)	0.72
	All migrants	1.10	(0.92–1.31)	0.30	0.99	(0.83–1.18)	0.93
(B) Age 0–4 years
All solid tumours	Incomers from outside the region	0.97	(0.83–1.13)	0.68	0.92	(0.78–1.08)	0.29
	All migrants	0.90	(0.76–1.05)	0.18	1.05	(0.90–1.23)	0.52
Brain and spinal tumours	Incomers from outside the region	0.98	(0.75–1.29)	0.89	0.84	(0.64–1.10)	0.21
	All migrants	0.9	(0.68–1.18)	0.44	0.98	(0.75–1.29)	0.89
Neuroblastoma	Incomers from outside the region	0.73	(0.51–1.04)	0.08	0.85	(0.60–1.21)	0.38
	All migrants	0.79	(0.56–1.12)	0.19	1.10	(0.78–1.55)	0.60
Other solid tumorsb	Incomers from outside the region	1.09	(0.86–1.39)	0.47	1.05	(0.82–1.33)	0.72
	All migrants	0.93	(0.73–1.18)	0.56	1.06	(0.83–1.35)	0.63
(C) Age 5–14 years
All solid tumours	Incomers from outside the region	0.80	(0.68–0.94)	0.01	0.77	(0.66–0.91)	0.002
	All migrants	1.16	(0.99–1.36)	0.07	0.80	(0.69–0.94)	0.01
Hodgkin's disease	Incomers from outside the region	0.57	(0.36–0.90)	0.01	0.60	(0.38–0.94)	0.02
	All migrants	0.89	(0.58–1.39)	0.62	0.67	(0.43–1.04)	0.07
Brain and spinal tumours	Incomers from outside the region	0.79	(0.63–1.00)	0.05	0.76	(0.60–0.96)	0.02
	All migrants	1.05	(0.83–1.33)	0.7	0.77	(0.61–0.98)	0.03
Other solid tumoursa	Incomers from outside the region	0.87	(0.67–1.13)	0.29	0.88	(0.68–1.15)	0.35
	All migrants	1.33	(1.03–1.73)	0.03	0.92	(0.71–1.19)	0.51

Odds ratios are for a trend in risk across the three equally weighted categories of population mixing. Significant effects (P<0.05) are shown in bold.

^aExcludes neuroblastoma.

^bExcludes Hodgkin's disease.