Table 1

Mean age at the start of treatment, duration of treatment, and length of follow up of leukaemia survivors

Irradiation dose	Number of patients		Age at start of treatment (range)		Duration of treatment (range)		Length of follow up from start of treatment (range)
Irradiation dose	Boys	Girls	Boys	Girls	Boys	Girls	Boys	Girls
18–20 Gy	45	73	6.0	5.2	2.2	2.2	12.3	10.7
18–20 Gy			(1.7–15.3)	(0.5–12.5)	(1.8–3.2)	(1.7–4.0)	(3.9–19.2)	(4.9–16.1)
22–24 Gy	41	54	4.9	5.9	2.4	2.3	13.4	10.5
22–24 Gy			(1.3–12.2)	(1.8–15.5)	(1.8–4.2)	(1.6–3.1)	(5.8–18.8)	(3.4–15.8)
No irradiation	37	48	4.1	4.5	1.9	2.0	4.9	4.7
No irradiation			(0.2–10.3)	(0.6–13)	(1.6–2.2)	(1.5–2.3)	(4.0–7.1)	(4.0–7.9)