Table 3

Summary of data from population based Danish study on association between head injury and schizophrenia²³

	Concussion	Severe head injury	Other fractures
*p<0.01. The authors present p values rather than confidence intervals.
No injury	1.0 (reference)	1.0	1.0
Injury	0.94	0.89	0.71*
Head injury, adjusting for fractures	1.37*	1.28*	–
Injury in the period
<1 year before case admission	2.00*	1.84*	1.10
1–5 years before case admission	0.92	0.71*	0.75*
>5 years before case admission	0.73*	0.78	0.58*