Table 2

Acute lymphatic leukaemia and exposure risk stratification at the place of birth

		Obs		Exp		SMR		RR		95% CI
		Obs		Exp		SMR		RR		Lower	Upper
	High risk
Male	3	1.50	2.00	4.26	0.66	34.31
Female	1	1.29	0.78	^2-150	0.15	^2-150
Total	4	2.79	1.43	5.67	1.06	42.27
	Normal risk
Male	11	7.31	1.50	3.21	0.84	20.19
Female	5	6.33	0.79	^2-150	0.70	^2-150
Total	16	13.64	1.17	4.64	1.29	28.26
	Low risk
Male	2	4.26	0.47	1
Female	0	3.65	0.00	1
Total	2	7.91	0.25	1
	Normal + High
Male	14	8.81	1.59	3.38	0.92	20.84
Female	6	7.62	0.79	^2-150	0.74	^2-150
Total	20	16.43	1.22	4.81	1.37	28.88

O: observed, E: expected, RR: interval estimation of relative risk, RR: 95% CI: 95% confidence limits of RR.
↵2-150 Values were not calculated as no cases occurred among women in the low risk group.