Halo’s real-world analysis is based on data from adults aged 18 and over who used the Halo device regularly and completed three validated Health-Related Quality of Life (HRQL) questionnaires at baseline and at weeks 2, 4, and 6. These measures capture self-reported changes in mood, sleep, and focus over time.

WHO-5 Well-Being Index (Mood)

The WHO-5 is a widely used measure of psychological well-being. It includes five positively worded statements assessing mood, motivation, and energy over the past two weeks.

• Score range: 0–100
• Higher scores indicate better well-being
• Interpretation:
  • 50 = Good well-being
  • 29–50 = Mildly reduced well-being
  • ≤ 28 = Indicative of poor well-being

Changes in WHO-5 scores reflect shifts in overall mood and emotional balance. In Halo’s data, average scores increased steadily across six weeks, with most users moving into the “good well-being” range by week 6.

PROMIS Sleep Disturbance (Reversed)

The PROMIS Sleep Disturbance questionnaire evaluates perceived sleep quality, refreshment, and restfulness. For clarity of interpretation, scores in Halo’s analysis were reversed, meaning higher values correspond to better sleep quality.

• Score range: 4–20
• Higher scores indicate better sleep
• Interpretation:
  • 12–20 = Green – Sleeping well and waking rested
  • 9–11 = Amber – Sleep could be more refreshing
  • 5–8 = Amber – Sleep quality affecting daytime function
  • 4 = Red – Very disrupted sleep

Mean sleep scores improved most notably by week 4, indicating better perceived sleep quality for the majority of users.

PROMIS Cognitive Function – Abilities (Focus)

The PROMIS Cognitive Function scale measures self-perceived concentration, mental clarity, and the ability to sustain attention.

• Score range: 4–20
• Higher scores indicate stronger focus and mental performance
• Interpretation:
  • 13–20 = Green – Healthy focus and concentration
  • 10–12 = Amber – Mild lapses in focus
  • 4–9 = Red – Lower-than-usual focus

Focus scores improved consistently throughout the 6-week period, with many users moving from the amber to green range after two weeks of use.

Data Interpretation

Results were derived using paired t-tests comparing each follow-up timepoint (weeks 2, 4, 6) with baseline. Changes are presented as mean improvements and percent change for each measure, alongside effect sizes to quantify the magnitude of improvement. Together, these metrics provide a clinically meaningful view of how regular Halo use supports well-being, sleep quality, and focus in healthy adults.