MPHQ-9: A Validated Mobile Version of the PHQ-9 for Real-Time Depression Tracking
- The MPHQ-9 adapts the standard PHQ-9 for ecological momentary assessment (EMA) — real-time, repeated self-monitoring via smartphone, validated in 280 depressed adults over 90 days (3 assessments/day)
- Strong internal consistency (Cronbach's alpha .91) and superior item-total correlations compared to the standard PHQ-9
- Better longitudinal stability (ICC = .58) than the traditional PHQ-9 (ICC = .37), capturing symptom dynamics rather than retrospective snapshots
- Moderate convergent validity with the standard PHQ-9 (r = .71) and IDAS-II depression subscale (r = .65)
The PHQ-9 is the workhorse of depression screening — used in virtually every clinical setting worldwide. But it captures a single retrospective snapshot: "over the last two weeks." The MPHQ-9 moves depression monitoring into real-time, validated for smartphone-based ecological momentary assessment. For clinicians practising measurement-based care, this is the tool that closes the gap between sessional screening and continuous monitoring.
How it works
The MPHQ-9 reformulates each PHQ-9 item for momentary assessment — asking about "right now" instead of "the past two weeks." In a study of 280 adults with major depressive disorder, participants completed the MPHQ-9 three times daily for 90 consecutive days. That is over 75,000 data points.
The psychometric results are strong. Internal consistency (alpha .91) matches or exceeds the standard PHQ-9. Item-total correlations are superior — every item discriminates better in the momentary format. Longitudinal stability (ICC = .58 vs .37) means the MPHQ-9 is more sensitive to genuine symptom changes rather than measurement noise.
Convergent validity with the standard PHQ-9 (r = .71) confirms it measures the same construct but with finer temporal resolution. The moderate (not perfect) correlation is expected and desirable — the whole point is to capture variation that a two-week retrospective average misses.
For your practice
If you use the PHQ-9 in intake or sessional monitoring, the MPHQ-9 adds a dimension you cannot get from a once-per-session score: diurnal patterns, trigger-response dynamics, and treatment response trajectories. A patient whose PHQ-9 drops from 18 to 12 looks like improvement — but the MPHQ-9 might reveal that mornings are still at 16 while evenings are at 8. That changes your intervention.
The tool is particularly valuable for medication titration (track response in real-time, not at the next appointment) and for treatment-resistant cases where understanding symptom dynamics matters more than aggregate severity.
The MPHQ-9 brings depression monitoring from retrospective snapshot to real-time measurement — a validated PHQ-9 adaptation for smartphone-based ecological momentary assessment.
Validated in a single study of 280 participants, predominantly in the US. Compliance with 3x daily assessments may decline over time in routine practice. Requires smartphone access and digital literacy. Not yet integrated into major EHR systems.