Daily Mental Health Scale (DMHS-10): Development and Psychometric Validation of an Ecological Momentary Assessment Tool in India

Imagine trying to understand the weather by looking at a single photograph taken once a year. You might see if it was generally sunny or rainy that year, but you would miss the sudden storms, the gentle breezes, and the rapid shifts that define the actual experience of living through the seasons. For decades, scientists studying human mental health have relied on similar snapshots: questionnaires filled out once, asking people to summarize how they felt over the last month or year. While these tools are useful for comparing one person to another, they struggle to capture the fluid, day-to-day reality of how an individual's mind changes. In recent years, a more dynamic approach has emerged, asking people to report their feelings frequently while they are still living through the moment. This method, often called ecological momentary assessment, offers a live feed of the human experience rather than a static memory. However, a significant gap has remained, particularly in countries like India: while researchers wanted to use these daily check-ins, they lacked a simple, scientifically tested tool designed specifically for this rapid, daily rhythm. Without a reliable instrument, the data collected could be as unreliable as a weather forecast based on a guess.

A team of researchers from several institutions across India set out to build and test such a tool, creating a scale specifically designed to be used by young adults every single day. They focused on emerging adults, people roughly between the ages of eighteen and twenty-five, a period of life often marked by significant transitions and emotional volatility. The goal was to develop a short, ten-item checklist that could capture the full picture of a person's mental health on any given day, distinguishing between the general mood of the day and specific feelings of stress or well-being. To ensure this tool worked, the researchers did not simply write questions and hope for the best; they subjected the scale to a rigorous process of refinement and testing, treating it like a new scientific instrument that needed to be calibrated before it could be trusted.

The journey began with the creation of the questions themselves. The researchers started with a broad list of nineteen potential items, drawing from established theories about mental health that view it as a balance between feeling good and functioning well. They then brought in a panel of thirteen experts, including psychiatrists, psychologists, and social workers, to review every single question. These experts acted as a quality control board, rating whether each question was relevant, clear, and representative of the concept of mental health. Based on their feedback, the list was trimmed and polished. Some questions were merged, others were rewritten to be more precise, and a few were discarded entirely. This process resulted in a streamlined set of eleven questions, which were then tested with a small group of young adults to see if the language made sense to them. Through these interviews, the researchers learned how people actually interpreted words like "stressed" or "lonely," making subtle adjustments to ensure the questions meant the same thing to everyone. They also created two slightly different versions of the scale, known as parallel forms, to prevent people from getting bored or memorizing answers if they used the tool every day for a month.

With the questions finalized, the researchers launched two separate studies to see how the scale performed in the real world. They recruited young adults from universities in Chennai and Chengalpattu, asking them to fill out the daily diary for thirty consecutive days. In the first study, seventy-one participants used a version of the scale with seven options for each answer, while in the second study, ninety-nine participants used a version with five options. The researchers wanted to see if the tool could reliably detect changes in a person's mood from one day to the next, and if the two different versions of the scale produced consistent results. They also checked if the scale could distinguish between different types of mental health, such as separating feelings of anxiety from feelings of sadness, and whether it aligned with other established measures of sleep quality and stress.

The results showed that the new scale, now called the Daily Mental Health Scale, worked remarkably well. The analysis confirmed that the questions naturally grouped into two main categories: one measuring negative feelings and symptoms, like stress and low mood, and the other measuring positive feelings and well-being, like satisfaction and energy. This two-part structure held true whether the researchers looked at how a single person changed over time or how different people compared to one another. The scale proved to be highly consistent, meaning that if a person felt a certain way on a given day, the tool captured that feeling reliably without random error. The two different versions of the scale were found to be equivalent, giving researchers the flexibility to switch between them without losing accuracy. Furthermore, the scores from the daily scale matched up logically with other known measures; for instance, days when people reported higher stress on the new scale also correlated with higher scores on standard anxiety tests and poorer sleep quality.

One of the most significant findings was that the scale successfully captured the difference between a person's general personality and their daily state. While many tools are designed to measure who a person is in a broad sense, this new tool was sensitive enough to track the daily fluctuations of their mental state. The researchers found that the scale was robust enough to handle the noise of daily life, providing a clear signal of mental health that was not just a reflection of a person's long-term traits. This distinction is crucial for understanding how mental health works in real time, allowing scientists to see how a specific event, like a difficult exam or a family gathering, might shift a person's mood for a day. The study also compared the seven-point and five-point versions of the scale, finding that while the seven-point version offered slightly more precision in distinguishing between high and low scores, the five-point version was easier for participants to use and still provided excellent results.

The study concluded that this new tool is a viable and reliable option for tracking mental health in daily life, particularly for young adults in India. It represents one of the first times a scale of this nature has been rigorously developed and validated for use in the Indian context, filling a gap that had previously hindered this type of research in the region. By proving that a brief, daily check-in can be both scientifically sound and culturally appropriate, the researchers have provided a new way to understand the complex, shifting landscape of the human mind. The work suggests that with the right tools, it is possible to move beyond static snapshots and begin to understand the dynamic, day-to-day story of mental health, offering a clearer view of how people truly feel as they live their lives.