Effect of the WAIO Digital Platform on Multidimensional Wellbeing in Adults in Argentina

实验性的：Immediate WAIO Access

Participants assigned to this arm will receive immediate access to the Wellbeing All-In-One (WAIO) progressive web application for the 6-month study period. They will also receive one weekly WhatsApp message encouraging engagement with the platform. WAIO integrates more than 30 interconnected digital tools organized across eight dimensions of wellbeing: physical, emotional, social, occupational, spiritual, financial, intellectual, and environmental.

行为的：WAIO Multidimensional Digital Wellbeing Intervention

A digital wellbeing intervention delivered through the Wellbeing All-In-One (WAIO) progressive web application. The platform integrates more than 30 interconnected digital tools organized across eight dimensions of wellbeing: physical, emotional, social, occupational, spiritual, financial, intellectual, and environmental. Artificial intelligence is used to personalize aspects of the user experience. Participants assigned to the immediate-intervention arm receive access to the platform during the 6-month comparison period and one weekly WhatsApp message encouraging engagement.

有源比较器：Active Waitlist Control

Participants assigned to this arm will not receive access to the WAIO platform during the 6-month comparison period. They will receive one general health information message per month through WhatsApp. After completion of the 6-month comparison period, participants will be offered access to WAIO beginning in month 7.

行为的：General Health Information Messages

Participants assigned to the active waitlist control arm receive one general health information message per month through WhatsApp during the 6-month comparison period. They do not receive access to the WAIO platform during this period. Access to WAIO is offered after completion of the 6-month comparison period, beginning in month 7.

Change in WAIO Integral Wellbeing Standardized Score From Baseline to 6 Months

The WAIO Integral Wellbeing Inventory assesses self-reported wellbeing across eight dimensions based on the SAMHSA wellness framework: physical, emotional, social, occupational, spiritual, financial, intellectual, and environmental wellbeing. A standardized overall score ranging from 0 to 100 will be calculated, with higher scores indicating higher integral wellbeing. Longitudinal scoring will use the items retained after the prespecified psychometric calibration phase.

Change in WAIO Integral Wellbeing Standardized Score From Baseline to 3 Months

The WAIO Integral Wellbeing Inventory assesses self-reported wellbeing across eight dimensions based on the SAMHSA wellness framework: physical, emotional, social, occupational, spiritual, financial, intellectual, and environmental wellbeing. A standardized overall score ranging from 0 to 100 will be calculated, with higher scores indicating higher integral wellbeing. Longitudinal scoring will use the items retained after the prespecified psychometric calibration phase.

Change in the Eight Dimension-Specific WAIO Wellbeing Scores

Dimension-specific wellbeing scores will be calculated for the eight domains assessed by the WAIO Integral Wellbeing Inventory: physical, emotional, social, occupational, spiritual, financial, intellectual, and environmental wellbeing. Each dimension-specific score will be standardized on a 0-to-100 scale, with higher scores indicating higher wellbeing in that dimension. Scores will be derived from the items retained after the prespecified psychometric calibration phase. Changes over time will be evaluated separately for each wellbeing dimension.

Change in Self-Rated General Health

Self-rated general health will be assessed using a single-item measure asking participants to rate their health in general. Response categories are Excellent, Very Good, Good, Fair, and Poor. Changes in the distribution of self-rated health responses will be evaluated over the follow-up period.

Participant Retention Rate at 3 and 6 Months

Percentage of randomized participants who remain in the study at each scheduled follow-up time point. Retention will be assessed at T1 (3 months) and T2 (6 months) using study and platform records.

Incidence of Adverse Events and Serious Adverse Events

The number and proportion of participants experiencing one or more adverse events or serious adverse events during the 6-month follow-up period will be assessed. Safety events will be identified through the study's SOS reporting mechanism and active safety monitoring procedures.

Correlation Between WAIO Exposure and Change in Multidimensional Wellbeing

Among participants assigned to the immediate WAIO intervention arm, exposure to the digital intervention will be quantified using backend logs, including total time of use, frequency of accesses, and completion rate. Correlation analyses will assess the relationship between these exposure indicators and the magnitude of change in overall and dimension-specific wellbeing scores from baseline to 6 months.

Internal Consistency of the WAIO Integral Wellbeing Inventory

The scale used is the Wellbeing All-In-One (WAIO) Integral Wellbeing Inventory. Its standardized wellbeing scores range from 0 to 100, with higher scores indicating higher wellbeing.

Internal consistency of the preliminary WAIO Integral Wellbeing Inventory and its dimension-specific subscales will be evaluated using Cronbach's alpha and McDonald's omega during the psychometric calibration phase. A Cronbach's alpha of 0.70 or higher is prespecified as the threshold for acceptable internal consistency of each subscale.

Factorial Structure of the WAIO Integral Wellbeing Inventory

The scale used is the Wellbeing All-In-One (WAIO) Integral Wellbeing Inventory. Standardized wellbeing scores derived from the inventory range from 0 to 100, with higher scores indicating higher wellbeing.

The factorial structure of the preliminary 40-item WAIO Integral Wellbeing Inventory will be evaluated using exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) to assess support for the hypothesized eight-dimensional wellbeing structure based on the SAMHSA framework.

Convergent Validity of the WAIO Integral Wellbeing Inventory

The scale used is the Wellbeing All-In-One (WAIO) Integral Wellbeing Inventory. Its standardized wellbeing score ranges from 0 to 100, with higher scores indicating higher wellbeing.

Convergent validity will be evaluated by examining correlations between WAIO Integral Wellbeing Inventory scores and standardized measures assessing related constructs during the psychometric calibration phase. The outcome of this analysis will be the strength and direction of the correlations between these measures.

Test-Retest Reliability of the WAIO Integral Wellbeing Inventory

The scale used is the Wellbeing All-In-One (WAIO) Integral Wellbeing Inventory. Its standardized wellbeing score ranges from 0 to 100, with higher scores indicating higher wellbeing.

Temporal stability of the WAIO Integral Wellbeing Inventory will be assessed in a randomly selected 10% subsample of participants from the psychometric calibration phase (approximately 20 participants). The inventory will be administered again 14 days after the baseline assessment, during an intervention-free interval. Test-retest reliability will be evaluated using the intraclass correlation coefficient (ICC), with higher ICC values indicating greater temporal stability. An ICC greater than 0.75 is prespecified as the threshold for acceptable temporal stability.