Psychological distress, glycated hemoglobin, and mortality in adults with and without diabetes.
OBJECTIVE
To examine associations between psychological distress, glucose metabolism, and death. There is limited information about the long-term prognosis of diabetic patients with psychological distress.


METHODS
In a representative cohort of 11,546 adults (6.2% with high-risk/undiagnosed diabetes and 4.8% with physician-diagnosed diabetes), we measured glycated hemoglobin A1C as an indicator of glucose metabolism and psychological distress with the 12-item General Health Questionnaire (GHQ-12).


RESULTS
During the mean follow-up of 4.7 years, there were 682 deaths (93 among diabetic, 88 in high-risk/undiagnosed diabetic [A1C ≥6.0% without physician-diagnosed diabetes], and 501 in nondiabetic participants). Psychological distress was apparent in 18.9%, 16.5%, and 13.4% of diabetic, high-risk/undiagnosed diabetic, and nondiabetic participants, respectively. In participants with diabetes, a unit increase in GHQ-12 score was associated with higher risk of death at follow-up (multivariate adjusted hazard ratio, 1.16; 95% confidence interval, 1.09-1.24). Levels of A1C were also higher in diabetic participants with distress (GHQ-12 score of >3) compared with those without (7.86% versus 7.40%; p = .008), although adjustment for A1C did alter the association between distress and mortality. In the whole sample, the coexistence of diabetes and distress was associated with an elevated risk of death, beyond that due to having either diabetes or distress alone (multivariate adjusted hazard ratio, 3.64; 95% confidence interval, 2.21-5.98).


CONCLUSIONS
Psychological distress is an independent risk factor for death in diabetic patients, although impaired glucose metabolism did not explain the excess risk.
Hamer
Mark
M
Department of Epidemiology and Public Health,University College London, London, United Kingdom. m.hamer@ucl.ac.uk
Stamatakis
Emmanuel
E
Kivimäki
Mika
M
Pascal Kengne
Andre
A
Batty
G David
GD
D000328:Adult; D001786:Blood Glucose / Q000032:analysis / Q000378:metabolism*; D002318:Cardiovascular Diseases / Q000401:mortality; D002423:Cause of Death; D015897:Comorbidity; D003920:Diabetes Mellitus / Q000097:blood / Q000453:epidemiology / Q000401:mortality*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000453:epidemiology / Q000401:mortality; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis* / Q000378:metabolism; D006304:Health Status; D006801:Humans; D038801:International Classification of Diseases; D008297:Male; D008875:Middle Aged; D016016:Proportional Hazards Models; D012307:Risk Factors; D013315:Stress, Psychological / Q000097:blood / Q000453:epidemiology / Q000378:metabolism*; D011795:Surveys and Questionnaires
D001786:Blood Glucose; D006442:Glycated Hemoglobin