Table 1. Distribution of parental radiation dose among 40 487 offspring of atomic-bomb survivors and controls.

		Paternal dose
mSv (mean)		0–4a	5–49	50–149	150–499	500–4000	Unknown	Not in city	Total
Maternal dose		(0)	(22)	(91)	(290)	(1148)	(–)	(0)
0–4a	(0)	5322	758	511	570	430	524	3279	11 394
5–49	(22)	532	435	206	128	60	148	564	2073
50–149	(92)	476	174	285	90	45	111	667	1848
150–499	(291)	515	169	113	272	55	89	601	1814
500–4000	(1004)	628	121	58	105	158	103	739	1912
Unknown	(–)	931	216	136	169	122	0	845	2419
Not in city	(0)	9396	1597	1901	1974	1711	2448	0	19 027
Total		17 800	3470	3210	3308	2581	3423	6695	40 487

^aClassified as the reference group.