A Tailored Gender-Sensitive mHealth Weight Loss Intervention (I-GENDO): Development and Process Evaluation

Abstract

Background Given the increase in the prevalence of overweight and obesity worldwide, the number of digital weight loss interventions has also risen. However, these interventions often lack theoretical background and data on long-term effectiveness. The consideration of individual and gender differences in weight-related psychological parameters might enhance the efficacy and sustainability of mobile-based weight loss interventions. Objective This paper presented an introduction to and the process evaluation of a 12-week gender-sensitive mobile health (mHealth) weight loss intervention (I-GENDO) combining computer-based and self-tailoring features. Methods Between August 2020 and August 2021, individuals with overweight (BMI 25.0-29.9 kg/m²), those with obesity class I (BMI 30.0-34.9 kg/m²), and those with obesity class II (BMI 35.0-39.9 kg/m²) were recruited to the I-GENDO project, a multicenter study in Germany. The mHealth intervention aimed at targeting individual psychological factors associated with the development and persistence of overweight and obesity (eg, emotional eating) using computer-based tailoring. Moreover, the intervention took a gender-sensitive approach by implementing self-tailoring of gender-targeted module versions. The computer-based assignment of the main modules, self-selection of gender-targeted module versions, and use patterns were evaluated while considering gender. Moreover, gender differences in the usability assessment were analyzed. Results Data from the intervention arm of the study were processed. A total of 116 individuals with overweight and obesity (77/116, 66.4% women; age mean 47.28, SD 11.66 years; BMI mean 33.58, SD 3.79 kg/m2) were included in the analyses. Overall, the compliance (90/109, 82.6%) and satisfaction with the app (mean 86% approval) were high and comparable with those of other mobile weight loss interventions. The usability of the intervention was rated with 71% (5.0/7.0 points) satisfaction. More women obtained the main module that focused on emotion regulation skills. Most men and women selected women-targeted versions of the main modules. Women used the app more frequently and longer than men. However, women and men did not differ in the progress of use patterns throughout the intervention. Conclusions We developed a tailored gender-sensitive mHealth weight loss intervention. The usability of and engagement with the intervention were satisfactory, and the overall satisfaction with the intervention was also high. Gender differences must be considered in the evaluation of the effectiveness and sustainability of the intervention.

I-PREGNO – prevention of unhealthy weight gain and psychosocial stress in families during pregnancy and postpartum using an mHealth enhanced intervention: a study protocol of two cluster randomized controlled trials

“…The app aims to help families to increase their mental health, to reduce psychosocial stress, and to broaden their knowledge about nutrition and physical activity topics via the completion of a variety of thematic modules. I-PREGNO was built on the technical and content-related knowledge gained from the gender-sensitive multicomponent mHealth weight loss intervention I-GENDO [ 46 ]. Both apps were developed within an iterative process by the authors working closely with an external software provider (groupXS Solutions GmbH).…”

“…In order to assess app usability the German version of the mHealth app usability questionnaire for standalone mHealth apps (MAUQ; patient version) will be used [ 46 , 77 ]. The questionnaire consists of 18 items, which are rated on a scale from 1 (‘strongly disagree’) to 7 (‘strongly agree’).…”

I-PREGNO – Prevention of unhealthy weight gain and psychosocial stress in families during pregnancy and postpartum using an mHealth enhanced intervention: A Study Protocol of two cluster randomized controlled trials

“…The questionnaire consists of 18 items, which are rated on a scale from 1 ('strongly disagree') to 7 ('strongly agree'). Psychometric properties were rated as very good (76,45). The MAUQ has a threefactor design comprising the subscales 'ease of use' (5 items), 'interface and satisfaction' (7 items), and 'usefulness' (6 items).…”

“…The app aims to help families to increase their mental health, to reduce psychosocial stress, and to broaden their knowledge about nutrition and physical activity topics via the completion of a variety of thematic modules. I-PREGNO was built on the technical and content-related knowledge gained from the gender-sensitive multicomponent mHealth weight loss intervention I-GENDO (45). Both apps were developed within an iterative process by the authors working closely with an external software provider (groupXS Solutions GmbH).…”

“…In order to assess app usability the German version of the mHealth app usability questionnaire for standalone mHealth apps (MAUQ; patient version) will be used (45,76). The questionnaire consists of 18 items, which are rated on a scale from 1 ('strongly disagree') to 7 ('strongly agree').…”