Table 2.

Rates of hospitalisation for self-harm, hospitalisation with a mental or somatic disorder diagnosis and mortality during the 3-year follow-up in adolescents and young adults hospitalised for a mental disorder in 2013–2014, compared with the non-affected control group without a mental disorder and matched for age and sex, and with the affected control group with a mental disorder but not hospitalised

During follow-up	Hospitalised patients (n=73 300)		Non-affected controls (n=219 900)		P value	Affected controls (n=9 683)		P value
	n	%	n	%		n	%
Hospitalisation for self-harm	7 266	9.9	148	0.1	<0.0001	654	6.8	<0.0001
Number of self-harm hospitalisation					<0.0001			<0.0001
1	4 539	62.5	141	95.3		438	67.0
2	1 358	18.7	7	4.7		135	20.6
3	544	7.5	0	0		40	6.1
4+	825	11.4	0	0		41	6.3
Self-harm means
Poisoning	6 015	82.8	126	85.1	0.45	527	80.6	0.2
Hanging	301	4.1	2	1.4	0.09	33	5.1	0.3
Drowning	26	0.4	0	0	–	2	0.3	1
Firearm	12	0.2	0	0	–	1	0.2	1
Fire	25	0.3	0	0	–	3	0.5	0.5
Sharp/blunt objects	1 380	19.0	14	9.5	0.003	110	16.8	0.2
Jumping	205	2.8	4	2.7	1	11	1.7	0.1
Vehicle	39	0.5	0	0	–	5	0.8	0.4
Other or unspecified	618	8.5	5	3.4	0.02	58	8.9	0.8
Hospitalisation with a somatic disorder diagnosis	21 082	28.8	13 562	6.2	<0.0001	2 105	21.7	<0.0001
Hospitalisation with a mental disorder diagnosis	42 196	57.6	633	0.3	<0.0001	3 694	38.2	<0.0001
Mortality (until 2017)	573	0.8	99	0.05	<0.0001	35	0.4	<0.0001
Cause of death (until 2015)	411		91			35
Natural	76	18.5	32	35.2	0.0005	12	34.3	0.6
Suicide	176	42.8	7	7.7	<0.0001	14	40.0	0.06
Accidental	92	22.4	39	42.9	<0.0001	6	17.1	0.09
Other or unknown	67	16.3	13	14.3	0.8	3	8.6	0.06