Is age of self-harm onset associated with increased frequency of non-suicidal self-injury and suicide attempts in adolescent outpatients?

Table 3 Negative binomial regression model for NSSI lifetime episodes with age of self-harm onset, duration of self-harm and selected covariates, in adolescents with repetitive self-harm (N = 103)

	Estimate	St. Error	z value	p-value	95% CI
(Intercept)	2.95	0.43	6.82	***	2.07	3.91
Relationship with mother	−0.03	0.01	−2.30	*	−0.05	−0.01
Physical abuse	−0.12	0.25	−0.47	n.s	−0.68	0.46
Sexual abuse	0.43	0.26	1.68	n.s	− 0.10	0.98
Age of onset	−0.19	0.09	−2.07	*	−0.39	−0.01
Duration of self-harm	0.16	0.09	1.82	0.068	−0.01	0.33
Age of onset - squared	−0.19	0.06	−3.35	***	−0.31	−0.10
Duration - squared	−0.19	0.06	−3.48	***	−0.31	−0.10
Age of onset x Duration (Interaction)	−0.36	0.10	−3.55	***	−0.58	−0.13

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