Table 2 Relative risks of self harm between the two control groups and the cases.

	Domestic violence victims/294	Incidence rate/1000 person years	Control Group 1/294	Incidence rate/1000 person years	Rate ratio (95% CI)	Control group 2/294	Incidence rate/1000 person years	Rate ratio (95% CI)
Self harmed in the study period	75	47	17	13	3.6 (2.1–6.5)	17	13	3.5 (2.1–6.4)
Episodes of self harm	160	101	30			39
Patient episodes at ED	552	394	356	276	1.3 (1.1–1.4)	361	285	1.2 (1.1–1.4)
Number of ED attendances per subject in the study period	1.87		1.21			1.23
Number of deaths in the study period	0	0	4*	7.4	N/A	1 *	2	N/A

*None of the deaths were because of suicide or domestic violence. ED, emergency department; N/A, not applicable.