Screening for undetected mental disorders in high utilizers of primary care services.
OBJECTIVE
To define the prevalence and detection rates of mental disorders among high utilizers as compared with typical utilizers, and to examine the effect of case-mix adjustment on these parameters.


METHODS
Cross-sectional study.


METHODS
General internal medicine outpatient clinic associated with an urban, academic medical center.


METHODS
From patients attending a general medicine clinic, 304 were selected randomly in three utilization groups, defined by number of clinic visits: (1) high utilizers; (2) case-mix adjusted high utilizers; and (3) typical utilizers (control patients).


METHODS
None.


RESULTS
The presence of any mental disorder was ascertained by the PRIME-MD screening instrument. Chart review on all patients was performed to ascertain mental disorders detected by primary care physicians. The prevalence of mood disorders was markedly higher in high utilizers (29%) than in adjusted high utilizers (15%) or controls (10%) (p <.001). Anxiety disorders were slightly, but not statistically, more prevalent in the group adjusted for case mix (16%) than in other high utilizers (12%) or controls (9%). Alcoholism was significantly more prevalent in controls (12%) than in adjusted (6%) or other high utilizers (3%) (p <.03). The discrepancy in detection rates between PRIME-MD and chart review for any mental disorder was less for high utilizers (37% vs 31%) as compared with adjusted high utilizers (31% vs 11%) or controls (24% vs 8%).


CONCLUSIONS
Mood disorders are associated with a high overall burden of illness, while anxiety disorders are more predominant among outliers after case-mix adjustment. Detection rates differ substantially by utilization pattern. Screening efforts can be more appropriately targeted with knowledge of these patterns.
Division of General Internal Medicine, Northwestern University Medical School, Chicago, Ill. 60611, USA.
F
F
Lefevre
D
D
Reifler
P
P
Lee
M
M
Sbenghe
N
N
Nwadiaro
S
S
Verma
P R
PR
Yarnold
D000328:Adult; D016009:Chi-Square Distribution; D003430:Cross-Sectional Studies; D003953:Diagnosis-Related Groups; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000175:diagnosis* / Q000453:epidemiology; D008875:Middle Aged; D009017:Morbidity; D015995:Prevalence; D011320:Primary Health Care / Q000706:statistics & numerical data*; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results