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Published Online: 27 March 2019

User Engagement in Mental Health Apps: A Review of Measurement, Reporting, and Validity

Abstract

Objective:

Despite the potential benefits of mobile mental health apps, real-world results indicate engagement issues because of low uptake and sustained use. This review examined how studies have measured and reported on user engagement indicators (UEIs) for mental health apps.

Methods:

A systematic review of multiple databases was performed in July 2018 for studies of mental health apps for depression, bipolar disorder, schizophrenia, and anxiety that reported on UEIs, namely usability, user satisfaction, acceptability, and feasibility. The subjective and objective criteria used to assess UEIs, among other data, were extracted from each study.

Results:

Of 925 results, 40 studies were eligible. Every study reported positive results for the usability, satisfaction, acceptability, or feasibility of the app. Of the 40 studies, 36 (90%) employed 371 indistinct subjective criteria that were assessed with surveys, interviews, or both, and 23 studies used custom subjective scales, rather than preexisting standardized assessment tools. A total of 25 studies (63%) used objective criteria—with 71 indistinct measures. No two studies used the same combination of subjective or objective criteria to assess UEIs of the app.

Conclusions:

The high heterogeneity and use of custom criteria to assess mental health apps in terms of usability, user satisfaction, acceptability, or feasibility present a challenge for understanding real-world low uptake of these apps. Every study reviewed claimed that UEIs for the app were rated highly, which suggests a need for the field to focus on engagement by creating reporting standards and more carefully considering claims.

HIGHLIGHTS

In response to the low uptake and low sustained use of mobile mental health apps, this systematic review examined studies evaluating mental health apps for depression, bipolar disorder, schizophrenia, and anxiety.
Of the 40 studies reviewed, 36 used at least some subjective criteria (371 subjective questions) and 25 used at least some objective criteria (71 measures) to assess user engagement.
Every study concluded that the user engagement indicators for the app were positive; however, no study used the same combination of criteria or the same thresholds to evaluate the app.
Mobile technologies are increasingly owned and utilized by people around the world. With this rise in pervasiveness comes the potential to increase access to and augment delivery of mental health care. This can occur in multiple ways, including patient-provider communication, self-management, diagnosis, and even treatment (1). Early evidence concerning the efficacy of mobile mental health apps has created a wave of enthusiasm and support (2). The potential scalability of these app-based interventions has been proposed as a means of addressing the global burden of mental illnesses and offering services to those who are in need but previously have not been able to access care (3). Even in developed countries, where access to mental health services remains inadequate, app-based interventions have been proposed as innovative research, screening, prevention, and care delivery platforms (4). The 10,000 mental health apps currently available for immediate download from the Apple iTunes or Google Android Play marketplaces speak to their easy availability, as well as to the high interest (5).
But potential, interest, or availability alone has not translated into the often-forecasted digital revolution for mental health. Many possible explanations exist, and one factor is the poor uptake of mental health apps (6). User engagement studies can shed valuable insight here. Many studies that evaluate mental health apps include an examination of usability, user satisfaction, acceptability, or feasibility. These “user engagement indicators” (UEIs) are meant to represent the ability of an app to engage and sustain user interactions. However, the lack of guidelines, consensus, or specificity regarding user engagement in mental health research introduces the concerning potential for UEIs to be selected inappropriately, presented with bias, or interpreted incorrectly. Thus it is difficult to interpret, let alone compare or pool data on, engagement metrics related to these smartphone apps. For example, in one study, participants described an app as “buggy,” “clunky,” and “didn’t really work” during qualitative interviews (7). Nevertheless, when the same participants were asked specifically whether the app was “user friendly” and “easy to use,” five of seven reported that the app was user friendly and easy to use. The authors used the responses to the second set of metrics as the basis for their conclusion that the app had positive UEIs, which masked potentially serious usability and safety concerns.
To both assess the current state of reporting and inform future efforts, we performed a systematic review of how the UEIs of apps designed for persons with depression, bipolar disorder, schizophrenia, and anxiety are evaluated. We hypothesized that there would be conflations in the definitions and criteria for common types of UEIs (namely, usability, satisfaction, acceptability, and feasibility), inconsistent subjective and objective criteria used to evaluate UEIs, and inconsistent thresholds of UEI ratings across studies.

Methods

Search String and Selection Criteria

We conducted a systematic search of PsycINFO, Ovid MEDLINE, the Cochrane Central Register of Controlled Trials and the AMED, Embase and HMIC databases on July 14, 2018, using terms synonymous with mobile apps for mental health. The full search algorithm is presented in Table 1. Inclusion criteria were as follows: report original qualitative or quantitative data; primarily involve a mobile application; be designed for people with depression, bipolar disorder, schizophrenia, or anxiety (including posttraumatic stress disorder and obsessive-compulsive disorder); include a conclusion about UEIs for the app (including usability, satisfaction, acceptability, or feasibility); and have a study length of at least 7 days. Reviews, conference reports, protocols, or dissertations were excluded, as were non-English language publications and publications that did not focus on the technologies or diseases of interest. All publications were screened by two authors (MMN and JT), and any disagreements were resolved through discussion resulting in consensus.
TABLE 1. Search algorithm for studies of mobile mental health apps, by PICO framework categorya
CategorySearch wordsb
PopulationDepression, depressive, mental illness, mental health, mood disorder, affective disorder, anxiety, phobia, bipolar, psychosis, schizophr*
InterventionSmartphone*, smart phone*, mhealth, mobile phone*, iphone*, android, mhealth, mobile app*, phone app*
Comparator[any]
OutcomeUsability, user interface, ui, feasib*, pilot, engag*, acceptability
a
PICO, population, intervention, comparator, outcome.
b
“OR” terms

Data Extraction and Synthesis

A tool was developed to systematically extract data, and the following data were gathered by two authors (MMN and JT). Study details included the study design (e.g., single arm or randomized controlled trial), sample size, inclusion criteria, and clinical characteristics of participants. Intervention details included information about the app, length of the intervention, and device type used. Data on objective UEIs included usage frequency, response to prompts, and trial retention. Data on subjective UEIs included satisfaction questionnaires, interviews about usability, and other similar data. Data were also gathered on factors that might influence usability, such as whether patients were involved in the app design process, incentives for participation, and other similar factors. Institutional review board approval was not required for this literature review.

Results

Included Studies

The initial database search returned 925 results. (A PRISMA chart in an online supplement to this article shows the full study selection process.) The 925 articles were reduced to 882 after duplicates were removed. A further 778 articles were excluded after the titles and abstracts were reviewed for eligibility. Full-text versions were retrieved for 104 articles, of which 64 were ineligible for various reasons (see PRISMA chart in online supplement).
Thus a total of 40 studies reporting UEIs of mental health apps for persons with mental illness were included (747). Of these, nine apps were designed for individuals with depression (11, 12, 19, 21, 27, 29, 40, 43, 46), four for those with bipolar disorder (16, 20, 22, 47), seven for those with schizophrenia (23, 25, 28, 33, 38, 39, 45), and seven for those with anxiety (15, 26, 3032, 35, 44). Thirteen apps were designed for two or more populations with different mental illnesses (810, 13, 14, 17, 18, 24, 34, 36, 37, 41, 42)
The mean number of participants enrolled was 32 per study (range two to 163). Of studies that reported the length or mean length of the study (some studies lasted as long as participants wanted to use the app), the mean length was 58 days.

UEIs: Usability, Satisfaction, Acceptability, and Feasibility

Every study performed an evaluation of the usability, satisfaction, acceptability, or feasibility of an app. Although we refer to these criteria as UEIs, the studies reviewed did not use UEI as a term or a framework. Across studies, conflations were noted in the definitions of and criteria for usability, satisfaction, acceptability, or feasibility. Some studies referred to these types of UEI interchangeably. For example, multiple studies used the phrase “usability/acceptability” (23, 24) (and another used the phrase “acceptability/usability” [25]). One referred to a “satisfaction/usability interview” (44). Another study first used the phrase “tolerability and usability” and later switched to “acceptability and tolerability” (47). Another first noted that “acceptability was measured by examining self-reports and user engagement with the program” but later stated that “acceptability was measured by examining users’ self-reported attitudes and satisfaction” (43). Yet another study used the technology acceptance model to partly evaluate the usability of an app (44).
Some studies treated certain UEIs as determinants of others. One study stated, “The BeyondNow app was also shown to be feasible given the high level of usability” (36). Another noted, “To evaluate acceptability of using a smartphone application as part of EP [early psychosis] outpatient care, participants completed self-report surveys at the end of the study evaluating satisfaction” (14). And under the subheading “Aim I–Feasibility: Mobile App Satisfaction,” another study reported, “Participants provided high usability ratings for the mobile app based on the SUS [System Usability Scale]” (8).
Most studies evaluated multiple UEIs at once. Eight drew conclusions about one type of UEI (e.g., usability only) (10, 12, 18, 21, 27, 30, 37, 41), 11 about two types of UEI (e.g., feasibility and acceptability) (9, 17, 19, 29, 31, 36, 38, 40, 44, 46, 47), 11 about three types (11, 1416, 20, 23, 24, 28, 34, 39, 45), and 10 about four types (8, 13, 22, 25, 26, 32, 33, 35, 42, 43). Furthermore, most studies used the same criteria to evaluate multiple UEIs. For instance, one stated, “Satisfaction, usability and acceptability were calculated based on the percentage of answers of the Likert-scale” (22). The fact that most studies used similar methods to evaluate more than one type of UEI speaks to the lack of precision and distinction between evaluation methods.

Types of Criteria: Subjective and Objective

The criteria used to draw conclusions about UEIs varied widely across studies, as shown in Figure 1. Of the 40 studies reviewed, 15 (38%) concluded that the app had positive UEIs entirely on the basis of subjective criteria (10, 12, 15, 18, 23, 27, 29, 3032, 37, 41, 44, 46, 47). Four (10%) concluded that the app had positive UEIs entirely on the basis of objective criteria (9, 17, 21, 28), and 21 (53%) concluded that the app had positive UEIs on the basis of a combination of subjective and objective criteria (8, 11, 13, 14, 16, 19, 20, 22, 2426, 3336, 38, 39, 40, 42, 43, 45).
FIGURE 1. Types of criteria used to evaluate user engagement indicators in 40 studies of mental health apps

Subjective criteria

The 36 studies (90%) that evaluated UEIs entirely or partially on the basis of subjective criteria relied on 371 indistinct questions (see table in online supplement) and were assessed by using surveys, interviews, or both. As shown in Table 2, a total of 13 studies derived inspiration from one or more preexisting assessment tools (4858). The remaining 23 studies did not rely on preexisting tools to evaluate subjective criteria, suggesting that they developed their own custom questions. This assortment of both subjective criteria and methodologies for evaluating UEIs demonstrates that there is no gold standard.
TABLE 2. Preexisting assessment tools used to evaluate user engagement indicators in studies of mental health appsa
ToolStudy
System Usability Scale (48)Levin et al., 2017 (8); Ben-Zeev et al., 2014 (25); Bauer et al., 2018 (41); Birney et al., 2016 (46)
Client Satisfaction Questionnaire (49)Possemato et al., 2017 (15); Wenze et al., 2016 (16); Boisseau et al., 2017 (32)
Credibility and Expectancy Scale (50)Wenze et al., 2016 (16); Watts et al., 2013 (27); Boisseau et al., 2017 (32)
Usefulness, Satisfaction, and Ease Questionnaire (51)Ben-Zeev et al., 2014 (25); Corden et al., 2016 (40)
Adaptation of another study's assessment tool (25, 52)Ben-Zeev et al., 2016 (23); Cernvall et al., 2018 (30)
Post-Study System Usability Questionnaire (53)Ben-Zeev et al., 2014 (25)
Technology Acceptance Model (54)Price et al., 2017 (44)
Technology Assessment Model Measurement Scale (55)Ben-Zeev et al., 2014 (25)
Therapeutic Alliance Scales for Children–Revised (56)Pramana et al., 2014 (26)
Client Evaluation of Services Questionnaire (57)Pramana et al., 2014 (26)
Computer System Usability Questionnaire (58)Pramana et al., 2014 (26)
a
There was no consensus among the studies on the best tool for evaluating user engagement indicators.

Objective criteria.

The 25 studies (63%) that evaluated UEIs entirely or partially on the basis of objective criteria relied on 71 indistinct measures of usage data (see online supplement). Of these 25 studies, five set a target usage goal in advance (8, 28, 34, 38, 39) and 20 considered usage data retrospectively (9, 11, 13, 14, 16, 17, 1922, 2426, 33, 35, 36, 40, 42, 43, 45) to determine positive UEIs.
Across all studies, a wide array of objective criteria was taken into account, including “average number of peer and coach interactions” (11), “length of time in clinic at enrollment” (14), “(reliable) logging of location” (19), “(number of) active users” (22) and “percentage of participants who were able to use both system-initiated (i.e., in response to prompts) and participant-initiated (i.e., on-demand) videos independently and in their own environments for a minimum of 3 days after receiving the smartphone” (33).

Thresholds of UEIs

All 40 studies concluded that their app had positive UEIs. However, the studies came to the same conclusion in different ways: they evaluated various types of UEIs with different methodologies—from the criteria used (such as subjective ratings and objective data) to the means of assessment (such as a survey, interview, or usage data). In other words, inconsistencies in the UEI evaluation process cast doubt on the studies’ ability to claim that their app was usable, satisfactory, acceptable, or feasible.

Subjective criteria.

Because of the range of both subjective criteria and their evaluation methods, it is impossible to compare the ratings of UEIs across studies. However, it is clear that studies utilized different thresholds for concluding that their app had positive UEIs. For example, of studies that evaluated the subjective criterion “ease of use,” the percentage of users reportedly satisfied with ease of use ranged from 60% (18) to 100% (13). Similarly, the satisfaction scores for ease of use ranged from 79.7% (46) to 92.6% (16). Despite the range of perceptions about the ease of use of an app, every study concluded that its app had positive UEIs.

Objective criteria.

Differences were noted across studies in objective criteria, such as target usage goals and frequency of usage. For example, of studies that set a target usage goal pertaining to task completion, two studies sought completion of over 33% of prompted tasks (28, 39) and another study sought completion of over 70% of prompted tasks (38). Despite this variability, all the studies that set a target usage goal concluded that the apps had positive UEIs on the basis of the usage data. Similarly, studies that considered frequency of usage as an objective criterion reported frequencies ranging from once per day (8) to once every other day (45) and an average of 5.64 times per participant over the course of 2 months (36). Yet each of these trials concluded that its app had positive UEIs.

Discrepancies between thresholds.

Even when an app seems to meet the threshold for positive UEIs on the basis of subjective criteria, it might not meet the threshold on the basis of objective criteria. One study raised the issue of possible discrepancies arising from evaluating UEIs solely on the basis of subjective versus objective criteria: “Analysis of objective use data for another study utilizing PTSD Coach indicates that although app users report positive feedback on usability and positive impact on symptom distress, only 80% of first-time users reach the home screen and only 37% progress to one of the primary content areas” (15). This is an issue not only within studies but also across studies. For instance, five studies that used retention rate as an objective criterion reported retention rates of 80% (35), 83% (11), 91.5% (21), 100% (38), and 100% (45). Yet studies that did not rely on retention rate as a criterion had retention rates as low as 35% (13) and 65.7% (27). All of these studies concluded that their apps had positive UEIs.

Discussion

Despite the real-world challenges of mental health app usability, engagement, and usage, all 40 studies included in this review reported that their app had positive UEIs. The positive reports for usability, satisfaction, acceptability, or feasibility were made whether the studies based their claims on either subjective or objective criteria—or a combination of criteria—and the studies unfailingly interpreted the UEI ratings as positive even when there was a wide range of reports and of usage data. These findings suggest that the authors of the studies did not establish a threshold indicating a positive UEI or that such thresholds were quite low. The inconsistency of the methodologies makes it difficult to define user engagement and how to best design for it. Furthermore, it calls into question the practices used to evaluate mental health apps.
The findings of this review indicate the lack of consensus about what constitutes usability, satisfaction, acceptability, and feasibility for mental health apps. This lack of consensus makes it difficult to compare results across studies, hinders understanding of what makes apps engaging for different users, and limits their real-world uptake. A great deal of ambiguity currently characterizes the distinctions between various types of UEI (see online supplement), which reduces the usefulness of these descriptors. There is thus a clear and urgent need to formulate standards for reporting and sharing UEIs so that accurate assessments and informed decisions regarding app research, funding, and clinical use can be made.
It is concerning that 15 of the 40 (38%) studies concluded that their app had positive UEIs without considering objective data (Figure 1). Qualitative data are unquestionably valuable for creating a fuller, more nuanced picture of participants, because their characteristics—such as language, disorder, and age—largely inform their ability to use an app and their unique experience of an app. However, there is also a need for objective measurements that can be reproduced to validate initial results and create a baseline for generalizing results of any single study. Consequently, a combination of both subjective and objective criteria may be most useful for offering insight into user engagement.
All studies concluded that their apps had positive UEIs on the bases of vastly different subjective and objective criteria (see online supplement). Although the thresholds for assessing a UEI as positive must depend on the specific purpose of the app (e.g., one study claimed that the use of a suicide prevention app by a single individual at a critical moment could be adequate [36]), predetermined thresholds for interpreting UEIs are urgently required for any meaningful conclusions to be drawn. Every study reviewed here claimed that its app had positive UEIs, which makes it difficult to understand the current challenges surrounding usability, engagement, and usage and hinders progress in the field.
This review had several limitations. After our search retrieved 925 studies, we reviewed only those from academic sources that focused on depression, bipolar disorder, schizophrenia, and anxiety. This restricted our discussion to how the academic community views engagement, as opposed to other industries, and limited the types of mental health apps we took into account. In addition, we assumed that it would be possible and useful for at least some dimensions of user engagement to be measured and reported consistently across mental health apps. Of course, apps that are developed for different purposes require their own specific criteria for determining whether they are engaging users or not. However, if every study claims that its app has positive UEIs and no studies use the same evaluation methods, as found in this review, it is difficult to understand and improve the real-world low uptake of these apps. Although publication bias may explain some of the results, the need for reporting standards is still clear. With more than 10,000 mental health apps in the commercial marketplaces, few of which have ever been studied or had assessment results published (5), the number of black boxes is immense when it comes to user engagement in mobile mental health apps. Examining different mental health conditions beyond those targeted in this review may have also yielded different results.

Conclusions

The experience of mental illness is personal, and the technology literacy of individuals is variable, meaning that no single scale or measurement will ever perfectly capture all engagement indicators for all people. But the future of the field of mobile mental health apps depends on user engagement, and the lack of clear definitions and standards for UEIs is harmful—not only to the field, where progress is impeded, but also to patients, who may not know which app to trust. This review has confirmed the necessity of generating more clarity regarding UEIs, which can both promote app usage and enable researchers to learn from each other’s work and design better mental health apps.
This challenge is compounded by the need to design specifically for the needs of individuals with mental illness. On the topic of Web site design, one study reported, “Commonly prescribed design models and guidelines produce websites that are poorly suited and confusing to persons with serious mental illnesses” (59). Given that smartphone apps are often more complex and interactive than Web sites, it is reasonable to assume that truly usable apps for mental illnesses may look different from apps designed for the general population. The inconsistencies illustrated in this study raise the possibility that no engagement indicators were designed to take into account the potentially unique cognitive, neurological, or motor needs arising from mental illnesses. For example, schizophrenia can lead to changes in cognition, depression can affect reward learning, and anxiety can affect working memory. Furthermore, it is important to consider how the intersectional identities of individuals with mental illness also shape their engagement with mental health apps. Combining lessons from technology design with knowledge about mental illnesses, such as schizophrenia (60), and applying these lessons to evaluations of UEIs could serve as a useful starting point. Other fields have found solutions, and the popularity of the engineering field–derived System Usability Scale (used in several studies in this review) indicates the potential of simple but well-validated metrics. Convening a representative body of patients, clinicians, designers, and technology makers to propose collaborative measures would be a welcome first step.

Supplementary Material

File (appi.ps.201800519.ds001.pdf)

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Information & Authors

Information

Published In

Go to Psychiatric Services
Go to Psychiatric Services

Cover: XXXX

Psychiatric Services
Pages: 538 - 544
PubMed: 30914003

History

Received: 17 November 2018
Revision received: 13 January 2019
Accepted: 14 February 2019
Published online: 27 March 2019
Published in print: July 01, 2019

Keywords

  1. Depression
  2. Schizophrenia
  3. Bipolar Disorder
  4. Computer technology

Authors

Details

Michelle M. Ng, B.A.
Division of Digital Psychiatry, Department of Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston (Ng, Torous); National Institute of Complementary Medicine Health Research Institute, Western Sydney University, Penrith, New South Wales, Australia, and Division of Psychology and Mental Health, Faculty of Biology, Medicine, and Health, University of Manchester, Manchester, United Kingdom (Firth); Headache Center, Department of Neurology, NYU Langone Health, NYU School of Medicine, New York (Minen).
Joseph Firth, Ph.D.
Division of Digital Psychiatry, Department of Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston (Ng, Torous); National Institute of Complementary Medicine Health Research Institute, Western Sydney University, Penrith, New South Wales, Australia, and Division of Psychology and Mental Health, Faculty of Biology, Medicine, and Health, University of Manchester, Manchester, United Kingdom (Firth); Headache Center, Department of Neurology, NYU Langone Health, NYU School of Medicine, New York (Minen).
Mia Minen, M.D.
Division of Digital Psychiatry, Department of Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston (Ng, Torous); National Institute of Complementary Medicine Health Research Institute, Western Sydney University, Penrith, New South Wales, Australia, and Division of Psychology and Mental Health, Faculty of Biology, Medicine, and Health, University of Manchester, Manchester, United Kingdom (Firth); Headache Center, Department of Neurology, NYU Langone Health, NYU School of Medicine, New York (Minen).
John Torous, M.D. [email protected]
Division of Digital Psychiatry, Department of Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston (Ng, Torous); National Institute of Complementary Medicine Health Research Institute, Western Sydney University, Penrith, New South Wales, Australia, and Division of Psychology and Mental Health, Faculty of Biology, Medicine, and Health, University of Manchester, Manchester, United Kingdom (Firth); Headache Center, Department of Neurology, NYU Langone Health, NYU School of Medicine, New York (Minen).

Notes

Send correspondence to Dr. Torous ([email protected]).

Competing Interests

The authors report no financial relationships with commercial interests.

Funding Information

Dr. Torous is supported by a career development award from the National Institutes of Health (NIH)/National Institute of Mental Health 1K23MH116130-01, and Dr. Minen is supported by 5K23AT009706 from the NIH/National Center for Complementary and Alternative Medicine.

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