Does recognition of depression in primary care affect outcome? The PREDICT-NL study

Area of Science:

• General Practice
• Mental Health Research
• Epidemiology

Background:

• Depression detection rates in primary care settings are below 50%.
• Previous studies indicate similar patient outcomes at 12 months for both recognized and unrecognized depression.
• Long-term outcomes beyond 12 months for depression in primary care are less understood.

Purpose of the Study:

• To investigate the recognition rates of depression in primary care.
• To examine the relationship between depression recognition and patient outcomes at 6, 12, and 39 months.

Main Methods:

• A prospective cohort study (PREDICT-NL) followed 1293 general practice attendees.
• Major Depressive Disorder (MDD) and its severity were assessed using DSM-IV criteria and the Patient Health Questionnaire 9 (PHQ-9).
• Mental function was measured using the Short Form 12 (SF-12); depression recognition was identified via International Classification of Primary Care and Anatomical Therapeutic Chemical codes.

Main Results:

• At baseline, 13% of participants had MDD, with only 36% recognized by their general practitioner (GP).
• Recognized depression at baseline was associated with more severe depressive symptoms (PHQ-9 difference: 2.7) and poorer mental function (SF-12 MCS difference: -3.8).
• After 12 and 39 months, no significant differences in outcomes were observed between recognized and unrecognized depression groups, though both groups fared worse than those without depression.

Conclusions:

• A small proportion of patients with Major Depressive Disorder (MDD) are identified in primary care settings.
• Patients with unrecognized depression experienced comparable outcomes at 12 and 39 months to those with recognized depression.