Table. Study Characteristics.

Source	Country	Population	Age at baseline, mean (SD), y	Total No. at baseline (female, %)	Intervention type (No. of modules) [duration]	Control condition	Measure of suicidal ideation	Dropout rate, %a
								Intervention group	Control group
van Spijker et at,33 2014	The Netherlands	Adults with suicidal thoughts	40.9 (13.7)	236 (66.1)	CBT, DBT problem-solving therapy, mindfulness-based therapy; unguided (6) [6 wk]	Wait-list	Beck Scale for Suicidal Ideation	9.5	8.3
Hill and Pettit,34 2016	United States	School students with perceived burdensomeness	16.9 (1.7)	80 (68.8)	CBT; unguided (2) [2 wk] plus psychoeducational emails	Attention-control (emails with psychoeducational information)	Beck Scale for Suicidal Ideation	12.2	10.03
Hetrick et at,35 2017	Australia	School students with suicidal ideation	14.7 (1.4)	50 (82.0)	CBT; guided (8) [10 wk] plus TAU	TAU (contact with the school well-being staff)	Suicidal Ideation Questionnaire	30.8	12.5
van Spijker et al,36 2018	Australia	Adults with suicidal thoughts	40.6 (11.9)	418 (77.3)	CBT, DBT, problem-solving therapy, mindfulness-based therapy; unguided (6) [6 wk]	Attention-control (6-wk online modular lifestyle information program)	Intensity of Suicidal Ideation subscale of the Columbia Suicide Severity Rating Scale	43.5	48.3
Wilks et al,37 2018	United States	Suicidal individuals with heavy episodic drinking and emotion dysregulation	38.0 (10.4)	59 (69.5)	DBT; guided (8) [8 wk]	Wait-list	Beck Scale for Suicidal Ideation	26.7	3.4
de Jaegere et al,38 2019	Belgium	Adults with suicidal thoughts	35.7 (13.6)	724 (59.4)	CBT, DBT, problem-solving therapy, mindfulness-based therapy; unguided (6) [6 wk]	Wait-list	Beck Scale for Suicidal Ideation	74.0	52.1

Abbreviations: CBT, cognitive behavioral therapy; DBT, dialectical behavioral therapy; TAU, treatment as usual.

^aRates shown are for participants who dropped out after the intervention was completed.