Table 2.

Externalizing Disorders and Externalizing Symptom Severity as Predictors of Suicidal Thoughts and Behaviors (STBs)

	All participants (N = 219)
	No STBs after preschool (n = 87)			STBs after preschool (n = 132)			No covariates		Covarying for sex and MDDa
	No.	n	(%)	No.	n	(%)	χ2	p	χ2	p
Externalizing disorders
FUV2 lifetime externalizing disorder	87	24	(27.6)	132	88	(66.7)	30.01	<.001	5.70	.017
FUV2 lifetime ADHD	87	17	(19.5)	132	62	(47.0)	16.17	<.001	1.88	.170
FUV2 lifetime ODD	87		(23.0)	132	66	(50.0)	15.35	<.001	1.99	.158
	No.	Mean	(SD)	No.	Mean	(SD)	χ2	p	χ2	p
Externalizing severity
FUV2 externalizing severity	54	0.43	(0.96)	99	1.02	(1.52)	6.03	.014	1.58	.209

	Participants with lifetime STBs at FUV1 (n = 91)
	No STBs after FUV1 (n = 45)			STBs after FUV1 (n = 46)			No covariates		Covarying for sex and MDDa
	No.	n	(%)	No.	n	(%)	χ2	p	χ2	p
Externalizing disorders
FUV2 lifetime externalizing disorder	45	24	(53.3)	46	33	(71.7)	3.24	.072	2.46	.117
	No.	Mean	(SD)	No.	Mean	(SD)	χ2	p	χ2	p
Externalizing severity
FUV2 externalizing severity	45	0.47	(1.06)	46	1.52	(1.77)	8.95	.003	6.65	.010

Note: ADHD = attention-deficit/hyperactivity disorder; FUV1 = follow-up visit 1; FUV2 = follow-up visit 2; MDD = major depressive disorder; NOS = not otherwise specified; ODD = oppositional defiant disorder.

^aSex was sex at birth. MDD was lifetime MDD/MDD-NOS through FUV2 for the models with lifetime disorders as predictors and current MDD/MDD-NOS at FUV2 for the models with current FUV2 severity as predictors.