Table 2 Number of cases, person-years follow-up and rates of first recorded diagnosis of PDD (per 10,000 person-years) by year of diagnosis and year of birth (in two year categories). The diagonally linked numbers identify rates among children of the same age in different years

From: Rate of first recorded diagnosis of autism and other pervasive developmental disorders in United Kingdom general practice, 1988 to 2001

	Year of first diagnosis
	1992–93			1994–95			1996–97			1998–99			2000–01
Birthyear	n	PY	rate	n	PY	rate	n	PY	rate	n	PY	rate	n	PY	rate
73–74	5	257638	0.19	5	263712	0.19	1	233838	0.04	4	194554	0.21	4	118997	0.34	age 26–28
75–76	0	233164	0.00	4	232393	0.17	5	208111	0.24	4	175331	0.23	2	107426	0.19	age 24–26
77–78	5	233093	0.21	2	227191	0.09	7	191785	0.36	8	162057	0.49	0	100419	0.00	age 22–24
79–80	1	265530	0.04	2	257752	0.08	9	211888	0.42	13	171491	0.76	3	104136	0.29	age 20–22
81–82	6	268477	0.22	3	262006	0.11	6	217307	0.28	20	174989	1.14	10	104093	0.96	age 18–20
83–84	10	275918	0.36	9	270128	0.33	4	226897	0.18	12	184013	0.65	5	110565	0.45	age 16–18
85–86	14	283299	0.49	11	277108	0.40	21	231591	0.91	28	187229	1.50	12	112080	1.07	age 14–16
87–88	26	294006	0.88	18	285548	0.63	16	237945	0.67	32	191788	1.67	31	114057	2.72	age 12–14
89–90	42	298297	1.41	45	289890	1.55	30	241271	1.24	48	194806	2.46	41	116246	3.53	age 10–12
91–92	5	248952	0.2	77	285511	2.70	53	238318	2.22	56	192373	2.91	51	114277	4.46	age 8–10
93–94	0	29342		9	231555	0.39	70	227807	3.07	89	184757	4.82	67	110641	6.06	age 6–8
95–96				0	26360		13	177284	0.73	98	176267	5.56	69	106292	6.49	age 4–6
97–98							0	20351		11	144307	0.76	81	104606	7.74	age 2–4
99–00										0	15479		4	79129	0.51	age 0–2

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