Table 3.

Distribution of exposed and relatively unexposed subjects according to the age of their mothers at the time of the accident (ATA)

Mother's age (y) ATA	Number of subjects
	Exposed	Relatively unexposed	Total
16	6	6	12
17	22	18	40
18	57	53	110
19	89	80	169
20	128	89	217
21	122	85	207
22	104	91	195
23	105	77	182
24	102	71	173
25	101	71	172
26	102	68	170
27	83	61	144
28	88	49	137
29	76	53	129
30	60	39	99
31	53	33	86
32	37	34	71
33	23	22	45
34	30	17	47
35	28	22	50
36	17	11	28
37	13	8	21
38	14	7	21
39	9	7	16
40	7	3	10
41	2	4	6
42	1	1	2
43	0	1	1
44	1	1	2
45	0	1	1
Unknown	14	5	19
Total	1494	1,088	2,582