Table 1.

The association between paternal and maternal age and risk of schizophrenia

Paternal age (years)	Count of cases	%	Count of controls	%t	Adjusted Odds Ratio	Lower 95% CI	Upper 95% CI
<20	297	1.44	1561	1.56	0.98	0.85	1.12
20–24	3005	14.60	16027	16.00	Reference
25–29	5436	26.41	28877	28.83	1.03	0.97	1.08
30–34	5075	24.66	25156	25.11	1.09	1.03	1.16
35–39	3517	17.09	16092	16.06	1.16	1.08	1.24
40–44	1960	9.52	8145	8.13	1.25	1.16	1.36
45–49	874	4.25	3032	3.03	1.50	1.35	1.66
50–54	281	1.37	918	0.92	1.59	1.37	1.85
≥ 55	137	0.67	368	0.37	1.95	1.58	2.40
Maternal age
<20	1380	6.70	6952	6.94	1.06	0.99	1.14
20–24	5271	25.61	27789	27.74	Reference
25–29	5896	28.65	30520	30.47	0.98	0.94	1.03
30–34	4430	21.52	20344	20.31	1.05	1.00	1.11
35–39	2647	12.86	10917	10.90	1.10	1.03	1.17
40–44	879	4.27	3411	3.41	1.07	0.97	1.17
≥ 45	79	0.38	243	0.24	1.21	0.93	1.58

^*Adjusted for age of spouse, birth year and sex of proband

Significant results shown in bold