Table 1

Cox proportional HRs for risk of any mental health disorder in veterans by age at recruitment, overall and by birth cohort, compared with all matched non-veterans

Age at entry (years)	HR	<17.5			17.5 to <20			20 to <25
Age at entry (years)	HR	95% CI	P value	HR	95% CI	P value	HR	95% CI	P value
Birth cohort
Overall	1.12	1.06 to 1.18	<0.001	1.30	1.23 to 1.38	<0.001	1.37	1.27 to 1.80	<0.001
1945–1949	1.16	0.99 to 1.36	0.061	1.28	1.10 to 1.48	0.001	1.49	1.25 to 1.79	<0.001
1950–1954	1.14	1.00 to 1.30	0.052	1.44	1.27 to 1.64	<0.001	1.50	1.26 to 1.78	<0.001
1955–1959	1.02	0.91 to 1.15	0.707	1.23	1.06 to 1.42	0.006	1.41	1.16 to 1.73	0.001
1960–1964	1.17	1.03 to 1.32	0.015	1.23	1.05 to 1.43	0.009	0.97	0.75 to 1.23	0.777
1965–1969	0.85	0.69 to 1.05	0.140	0.99	0.84 to 1.17	0.915	1.31	1.11 to 1.56	0.001
1970–1974	1.14	0.94 to 1.39	0.196	1.42	1.22 to 1.66	<0.001	1.06	0.81 to 1.38	0.671
1975–1979	1.93	1.48 to 2.52	<0.001	1.51	1.17 to 1.93	0.001	1.81	1.40 to 2.32	<0.001
1980–1984	1.67	1.33 to 2.09	<0.001	1.42	1.12 to 1.81	0.003	1.37	0.93 to 2.02	0.109
1985–1995	1.10	0.71 to 1.71	0.670	1.55	1.10 to 1.21	0.012	1.15	0.68 to 1.94	0.594