Table 2. Participants’ hierarchical logistic regression analyses results,^a with intentional suicide attempts^b as the dependent variable (N = 494^c).

Independent variables		Model 1			Model 2			Model 3			Model 4
		B	Wald	OR	B	Wald	OR	B	Wald	OR	B	Wald	OR
Demographics and historical factors
	Age, yr	0.02	2.90	1.02	0.01	0.63	1.01	0.01	0.65	1.01	0.01	0.59	1.01
	Sex (female)	−0.96	7.91	0.38**	−0.82	5.29	0.44*	−0.80	4.86	0.45*	−0.80	4.78	0.45*
	Previous suicide attempts (yes)	0.43	2.33	1.54	0.41	1.84	1.50	0.36	1.41	1.44	0.15	0.21	1.16
	Psychiatric treatment (yes)	0.31	0.83	1.36	0.56	2.32	1.75	0.67	3.13	1.95	0.50	1.63	1.64
	Psychiatric hospitalizations (yes)	−0.06	0.04	0.95	−0.10	0.10	0.91	0.06	0.04	1.06	0.21	0.38	1.24
Characteristics of self-injury
	Cutting (yes)				−0.45	2.33	0.64	−0.30	0.98	0.74	−0.27	0.73	0.77
	Lethality of injury (higher)				1.37	23.09	3.95***	1.34	21.10	3.81***	1.67	27.41	5.34***
Status at the time of self-injury
	Planned (yes)							2.20	4.38	9.041*	2.00	3.22	7.38
	Alcohol (yes)							0.56	3.27	1.75	0.63	3.81	1.88
	Suicide note (yes)							1.06	1.90	2.90	0.86	1.23	2.36
	Seeking help (yes)							−0.47	2.98	0.62	−0.45	2.47	0.64
Current suicidal ideation and plans
	Sustained suicidal ideation (yes)										1.04	9.25	2.83**
	Future suicidal plans (yes)										0.74	3.94	2.10
Statistics of the model
	-2LL	423.880			387.997			370.882			345.822
	Model χ2	16.957 (df = 5)**			52.839 (df = 7)***			69.954 (df = 11)***			95.015 (df = 13)***
	Step χ2	16.957 (df = 5)**			35.883 (df = 2)***			17.115 (df = 4)**			25.061 (df = 2)
	Nagelkerke R2	0.057			0.172			0.224			0.296
	Classification accuracy	83.6			83.4			83.4			84.0

OR = odds ratio, MSA = minor intent suicide attempt, SSA = serious intent suicide attempt.

^*P < 0.05, ^**P < 0.01, ^***P< 0.001.

^aParticipants included non-suicidal self-injury, MSAs, and SSAs.

^bIntentional suicide attempts include MSA and SSA.

^cCases with missing values for any independent variable were excluded from the analysis.