Table 4

HRs, 95% CIs and p values compared with individuals without ASD or ID born in 1993 as shown in figure 3

Case status	Birth year	HR	95% CI		p Value (compared with baseline)
No ASD or ID	1983	Baseline
	1984	0.997	0.985	1.009	0.587
	1985	0.994	0.982	1.007	0.352
	1986	0.974	0.962	0.987	<0.001
	1987	0.930	0.918	0.943	<0.001
	1988	0.960	0.947	0.973	<0.001
	1989	0.934	0.921	0.947	<0.001
	1990	0.929	0.915	0.942	<0.001
	1991	0.946	0.932	0.960	<0.001
	1992	0.960	0.946	0.974	<0.001
	1993	0.968	0.954	0.982	<0.001
	1994	0.972	0.958	0.987	<0.001
	1995	0.975	0.960	0.990	0.001
	1996	0.999	0.984	1.015	0.943
	1997	1.036	1.019	1.052	<0.001
	1998	1.041	1.024	1.058	<0.001
	1999	1.031	1.014	1.049	<0.001
Mild ID no ASD	1983	4.626	4.418	4.844	<0.001
	1984	2.192	2.061	2.332	<0.001
	1985	2.852	2.704	3.009	<0.001
	1986	2.958	2.811	3.112	<0.001
	1987	2.558	2.436	2.686	<0.001
	1988	3.328	3.175	3.488	<0.001
	1989	3.014	2.869	3.166	<0.001
	1990	3.019	2.875	3.170	<0.001
	1991	2.539	2.408	2.678	<0.001
	1992	2.736	2.601	2.879	<0.001
	1993	3.079	2.904	3.266	<0.001
	1994	3.017	2.848	3.197	<0.001
	1995	2.821	2.632	3.024	<0.001
	1996	3.662	3.421	3.920	<0.001
	1997	3.254	2.960	3.577	<0.001
	1998	3.896	3.498	4.339	<0.001
	1999	4.001	3.549	4.510	<0.001
Severe ID no ASD	1983	6.813	6.046	7.676	<0.001
	1984	5.783	5.052	6.620	<0.001
	1985	4.619	4.014	5.314	<0.001
	1986	8.095	7.252	9.038	<0.001
	1987	10.362	9.257	11.599	<0.001
	1988	11.129	10.030	12.348	<0.001
	1989	8.089	7.245	9.033	<0.001
	1990	11.263	10.049	12.625	<0.001
	1991	20.315	18.789	21.965	<0.001
	1992	8.552	7.491	9.763	<0.001
	1993	11.824	10.050	13.909	<0.001
	1994	12.425	10.556	14.626	<0.001
	1995	17.095	14.755	19.806	<0.001
	1996	9.998	8.007	12.485	<0.001
	1997	20.663	17.483	24.422	<0.001
	1998	20.499	18.260	23.013	<0.001
	1999	7.245	5.612	9.353	<0.001
ASD & ID	1983	1.352	0.945	1.934	0.099
	1984	1.743	1.313	2.313	<0.001
	1985	2.206	1.745	2.789	<0.001
	1986	2.081	1.664	2.602	<0.001
	1987	5.996	5.353	6.715	<0.001
	1988	2.246	1.838	2.744	<0.001
	1989	3.081	2.665	3.563	<0.001
	1990	2.642	2.227	3.134	<0.001
	1991	4.074	3.579	4.638	<0.001
	1992	2.039	1.696	2.450	<0.001
	1993	1.762	1.428	2.175	<0.001
	1994	3.448	3.021	3.936	<0.001
	1995	1.821	1.516	2.186	<0.001
	1996	4.367	3.872	4.925	<0.001
	1997	2.225	1.927	2.568	<0.001
	1998	2.102	1.800	2.454	<0.001
	1999	2.264	1.936	2.647	<0.001
ASD no ID	1983	2.048	1.508	2.782	<0.001
	1984	2.321	1.773	3.038	<0.001
	1985	1.095	0.671	1.787	0.718
	1986	3.387	2.661	4.312	<0.001
	1987	1.720	1.338	2.211	<0.001
	1988	1.104	0.712	1.712	0.657
	1989	1.936	1.527	2.456	<0.001
	1990	2.088	1.690	2.580	<0.001
	1991	2.139	1.777	2.575	<0.001
	1992	2.207	1.843	2.645	<0.001
	1993	2.928	2.471	3.469	<0.001
	1994	1.819	1.477	2.239	<0.001
	1995	1.874	1.524	2.305	<0.001
	1996	1.691	1.384	2.066	<0.001
	1997	1.638	1.293	2.074	<0.001
	1998	2.080	1.562	2.768	<0.001
	1999	2.728	2.001	3.720	<0.001
Biomedical ID	1983	4.812	4.443	5.211	<0.001
	1984	5.748	5.328	6.200	<0.001
	1985	5.012	4.615	5.444	<0.001
	1986	5.480	5.041	5.958	<0.001
	1987	6.311	5.832	6.829	<0.001
	1988	5.369	4.900	5.883	<0.001
	1989	7.738	7.095	8.438	<0.001
	1990	8.700	8.089	9.358	<0.001
	1991	13.724	12.984	14.505	<0.001
	1992	7.796	7.161	8.488	<0.001
	1993	8.786	8.127	9.497	<0.001
	1994	7.086	6.355	7.902	<0.001
	1995	8.710	8.017	9.463	<0.001
	1996	7.535	6.798	8.353	<0.001
	1997	7.182	6.403	8.057	<0.001
	1998	6.102	5.370	6.935	<0.001
	1999	10.575	9.584	11.667	<0.001

ASD, autism spectrum disorder; ID, intellectual disability.