Table 2.

Uptake and usage data.

Publication	Intervention (data collection period)	Registrations/downloads (time period in months)	Average registrations /downloads per month	At least minimal use	Moderate use	Completion or sustained use
Christensen et al (2002) [24]a	MoodGYM Mark I (Apr 2001 to Sep 2001)	2909 (6)	485	51.7% completed at least one depression assessment	16% completed at least two depression assessments	Not stated
Christensen et al (2004) [25]	MoodGYM Mark I (Apr 2001 to Sep 2003)	19,607 (30)	654	62% completed at least one depression assessment	15.6% completed two or more modules	0.5% completed a noncompulsory assessment at beginning of the last module
Christensen et al (2006) [26]	MoodGYM Mark II (Sep 2003 to Oct 2004)	38,791 (14)	2,770	69% completed at least one depression assessment	Less than 7% progressed beyond two modules	Not stated
Batterham et al (2008) [27]b	MoodGYM Mark II (Jan 2006 to Apr 2007)	82,159 (16)	5135	37% completed one or more modules	10% completed 2 or more modules	Not stated
Neil et al (2009) [28]	MoodGYM Mark II (Jan 2006 to Nov 2007—adolescents)	7207 (23)	313	40.6% completed one or more modules	11.1% completed 2 or more modules	2.8% completed all 5 modules
Al-Asadi et al (2014) [18]	Anxiety Online (Oct 2009 to Jan 2012)	9394 persons completed assessmentc (28)	336	33.1% accepted and commenced self-help programd	Not stated	3.7% of those who completed the first assessment also completed the post-treatment assessment
Lara et al (2014) [29]	HDep (Mar 2009 to Apr 2013)	17,318 persons registered and entered site at least twicee (50)	346	71.4% completed the first module	10% of users did module 4 (users could miss modules, so may not have completed 4)	Not stated
Menzies et al (2016) [19]	CBTPsych (Aug 2011 to Mar 2014)	267 (32)	8	88% logged on at least once	39% completed 4 or more modules	19.5% completed all 7 modules
Owen et al (2015) [20]	PTSD Coach (Mar 2011 to June 2014)	153,834 (36)	4273	61.1% returned to use the app after the day it was installed	52.1% continued to use app 1 week after installation; 41.6% continued to used app 1 month after installation	No specific completion point; however, 28.6% continued to use the app after 3 months, 19.4% continued after 6 months, and 10.6% after 1 year
Lattie et al (2016) [30]	Intellicare Apps (Sep 2014 to Oct 2015)	5210 (13)	401	84.1% of downloaded apps were launched at least once; between 38.7% and 70.2% of users used apps for at least one day	Between 4.7% and 35.7% (depending on specific app) of active users used the app on 10 or more occasions; between 13.1% and 23.3% used the app for 28 or more days	Not stated
Carpenter et al (2016) [23]	Happify (Dec 2014 to May 2016)	Total downloads not reported. 720,952 persons completed an assessment (18)f	40,053	21.2% of those who had completed an assessment at registration completed at least one more assessmentf	20.6% also completed an assessment at 2 weeks, 7.2% completed an assessment at 4 weeksf	3.5% completed an assessment at 6 weeks, 2.1% completed an assessment at 8 weeks

^aThe timeframe covered in this study is a subset of that reported by Christensen et al [25] for the same intervention, but the 2002 study reports some data that are not reported in the 2004 study.

^bThe timeframe reported in this study is a subset of that reported by Neil et al [28] for the same intervention. However, this study reports data for all registrants, whereas Neil et al’s [28] study only reports data for adolescent users.

^cPersons (n=9394) completed an online assessment and were then offered an online self-help or therapist-assisted program. No other indications of registration are reported.

^dPersons (n=3107) selected and commenced an online self-help program; they did not formally withdraw and were not recorded as “in progress” at the time of the publication.

^eNo other registration data were reported.

^fAssessments were not compulsory.