Table 2. Absolute numbers of childhood leukaemia cases and controls by study and exposure level.

Total leukaemia cases						Acute lymphoblastic leukaemia cases
	<0.1 μT	0.1–0.2 μT	0.2–0.3 μT	⩾0.3 μT	Total	<0.1 μT	0.1–0.2 μT	0.2–0.3 μT	⩾0.3 μT	Total
Measurement studies
Brazil	120	23	8	11	162	120	23	8	11	162
Germany	474	30	6	4	514	418	24	6	4	452
Japan	279	17	8	8	312	225	13	6	7	251
Total	873	70	22	23	988	763	60	20	22	865
Controls
Brazil	416	90	29	30	565
Germany	1212	74	12	3	1301
Japan	552	29	10	12	603
Total	2180	193	51	45	2469
Calculated field studies
Italy1	116	3	0	0	119	93	2	0	0	95
Italy2	45	0	0	1	46	36	0	0	1	37
UK	9657	6	0	2	9665					n/a
Total	9818	9	0	3	9830
Controls
Italy1	469	5	1	1	476
Italy2	181	1	0	2	184
UK	9671	3	1	2	9677
Total	10 321	9	2	5	10 337