Table 1.

Empirical data on internet-delivered early interventions.

Study (year)	Outcome measures	Intent-to-treat results	Completer results
Cox et al (2010) [31]	TSCC-Aa; IES-Rb	No advantage of intervention on any outcome at any assessment	Advantage of intervention on anxiety only, at both follow-up assessments
Kassam-Adams et al (2016) [32]	CPSSc; PedsQLd	No advantage of intervention on any outcome at any assessment	NRe
Mouthaan et al (2013) [27]	CAPSf; IES-R; HADSg	No advantage of intervention on any outcome at any assessment	Results similar to intention-to-treat (ITT) analyses for all outcome measures (statistics not reported in paper)
Ruggiero et al (2015) [30]	National Survey of Adolescents PTSDh, depression, substance use modules	No advantage of intervention on any outcome at any assessment	Results similar to ITT analyses for all outcome measures (statistics not reported in paper)
Steinmatz et al (2012) [28]	PSSi; CSEj; MPSSk; CES-Dl; PSWQm	Advantage of intervention on worry at postassessment.	NR
Van Voorhees et al (2012) [29]	CES-D 10; PCL-Mn	Advantage of intervention on depression at 4 and 12 weeks and on PTSD at 4, 8, and 12 weeks	Advantage of intervention on depression at 4 and 12 weeks and PTSD at 4, 8, and 12 weeks
Zatzick et al (2015) [20]	PCL-Co; PHQ-9p	Advantage of intervention on PTSD at 6 months	NR

^aTSCC-A: Trauma-Symptom Checklist for Children-A.

^bIES-R: Impact of Event Scale-Revised.

^cCPSS: The Child PTSD Symptom Scale.

^dPedsQL: Pediatric Quality of Life Inventory.

^eNR: not reported.

^fCAPS: Clinician-Administered PTSD Scale.

^gHADS: Hospital Anxiety and Depression Rating Scale.

^hPTSD: posttraumatic stress disorder.

ⁱPSS: Perceived Stress Scale.

^jCSE: Coping Self-Efficacy Scale for Trauma.

^kMPSS: Modified PTSD Symptoms Scale.

^lCES-D: Center for Epidemiologic Studies Depression Scale.

^mPSWQ: Penn State Worry Questionnaire.

ⁿPCL-M: PTSD-Checklist Military version.

^oPCL-C: PTSD Checklist Civilian version.

^pPHQ-9: Patient Health Questionnaire-9.