Trial results for a pilot study investigating different approaches to Bright Light Therapy (BLT) for Depression were posted on 2025-06-06, showing significant differences in Patient Health Questionnaire-9 (PHQ-9) scores between intervention groups (p=0.014).
Background
Depression is a common mental health condition that can significantly impact quality of life. Bright Light Therapy (BLT) is an established intervention for certain types of depression. This pilot study aimed to compare various approaches for delivering BLT to patients in a real-world setting, with the goal of informing a larger, fully powered effectiveness trial. Understanding how best to encourage BLT initiation and adherence is crucial for maximizing its potential benefits in clinical practice.
Trial design
This completed study, designated as Phase NA, enrolled 92 participants with Depression. The trial was a randomized pilot designed to compare three approaches for delivering Bright Light Therapy (BLT). Arm 1 participants received Kaiser Permanente (KP) treatment as usual (TAU) without BLT assistance. Arm 2 participants received brief written educational material on BLT. Arm 3 participants received written educational material along with phone coaching assistance to promote BLT initiation and adherence. The study was not powered for hypothesis testing but aimed to prepare for a future effectiveness trial.
Key results
The trial measured Patient Health Questionnaire-9 (PHQ-9) scores, a scale for depression severity, across the three intervention groups at multiple time points:
- Treatment as Usual (TAU):
- Mean score of 12.9 (Standard Deviation 5.3)
- Mean score of 12.2 (Standard Deviation 5.6)
- Mean score of 10.0 (Standard Deviation 4.8)
- Mean score of 10.4 (Standard Deviation 6.1)
- Minimal BLT Encouragement:
- Mean score of 13.7 (Standard Deviation 5.1)
- Mean score of 10.8 (Standard Deviation 6.5)
- Mean score of 10.0 (Standard Deviation 5.7)
- Mean score of 9.4 (Standard Deviation 5.4)
- Enhanced BLT Encouragement + Adherence Promotion:
- Mean score of 13.8 (Standard Deviation 6.0)
- Mean score of 9.3 (Standard Deviation 5.3)
- Mean score of 9.1 (Standard Deviation 5.2)
- Mean score of 8.3 (Standard Deviation 6.2)
A Mixed Models Analysis was conducted, yielding a p-value of 0.014 for planned comparisons. These comparisons included "Enhanced BLT Encouragement + Adherence Promotion" versus "Minimal BLT Encouragement", and both "Minimal BLT Encouragement" and "Enhanced BLT Encouragement + Adherence Promotion" versus "TAU".
What this means
The pilot study results suggest that providing enhanced encouragement and adherence promotion for Bright Light Therapy (BLT) may lead to more favorable outcomes in patients with depression, as indicated by generally lower PHQ-9 scores in the enhanced support group over time and a statistically significant difference in comparisons between the intervention groups. While this pilot was not powered for definitive hypothesis testing, the observed differences and the p-value of 0.014 provide valuable preliminary data to inform the design and justification of a larger, fully powered effectiveness trial.
Source
The information regarding these trial results was obtained from ClinicalTrials.gov, a public database of clinical studies. The results for the study NCT05356130, titled "Bright Start Study", were posted on 2025-06-06 on clinicaltrials.gov.