Table 2.

Incidence rate ratios for self-harm from age 15 in relation to specific child-parent separation trajectories during upbringing with an exposure prevalence of 0.1% or greater.

Separation trajectoriesa	Exposure prevalence (%)	npersons (self-harm)	Incidence rateb	IRRc	(95% CI)
N	65.5	13,350	12.1	1.00 (ref.)	–
N→F	16.3	6518	27.1	2.07	(2.01–2.14)
N→F→N	2.5	968	25.6	1.97	(1.84–2.10)
N→M	2.2	809	23.1	1.94	(1.81–2.08)
F	2.0	1222	39.2	3.10	(2.93–3.29)
F→N	1.9	701	19.2	1.72	(1.59–1.85)
N→F→N→F	1.6	880	35.4	2.72	(2.53–2.91)
N→F→M	1.1	643	44.4	3.28	(3.03–3.55)
F→N→F	0.91	531	36.8	3.01	(2.75–3.27)
N→M→F	0.55	244	32.0	2.41	(2.12–2.73)
N→F→FM	0.40	522	86.5	6.92	(6.33–7.54)
N→FM	0.39	309	43.3	4.03	(3.59–4.50)
N→M→N	0.33	107	19.7	1.62	(1.33–1.94)
N→F→M→F	0.29	208	58.1	4.02	(3.49–4.60)
N→F→N→F→N	0.28	170	39.9	3.01	(2.58–3.49)
FM	0.21	70	12.0	1.48	(1.16–1.86)
F→FM	0.21	278	92.6	7.25	(6.42–8.14)
F→N→F→N	0.21	108	30.6	2.49	(2.05–2.99)
N→F→N→F→N→F	0.17	131	49.6	3.77	(3.15–4.45)
N→F→FM→F	0.16	192	69.3	6.04	(5.22–6.94)
N→FM→N	0.15	105	34.7	3.34	(2.74–4.03)
F→N→F→N→F	0.14	96	41.7	3.35	(2.72–4.07)
N→F→N→M	0.14	82	38.2	3.05	(2.44–3.77)
N→F→N→F→M	0.12	87	53.3	3.91	(3.14–4.79)
All other trajectories	2.3	2153	58.4	4.86	(4.64–5.09)

^aN = Separated from neither parent; F = separated from father; M = separated from mother; FM = separated from both parents.

^bIncidence rate per 10,000 person-years at risk.

^cIRR - Incidence rate ratio.