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Letters to the Editor   |    
Dr. Surtees Replies
PAUL G. SURTEES
Am J Psychiatry 2008;165:1204-1204. doi:10.1176/appi.ajp.2008.08040523r

To the Editor: Drs. Vinkers and van der Mast ask whether depression increased noncardiovascular mortality in the EPIC-Norfolk study. Based on the 19,649 participants who were followed up through July 31, 2006 and all adjustments as previously reported, past-year major depressive disorder was not associated with either cancer mortality (hazard ratio based on 813 deaths=0.73, 95% confidence interval [CI]=0.45–1.18) or deaths from cardiovascular causes other than ischemic heart disease (hazard ratio based on 310 deaths=0.89, 95% CI=0.39–2.04). In addition, we recently reported more specifically that past-year major depressive disorder was not associated with incident stroke (1). Previous studies based on the EPIC-Norfolk data have shown evidence that individual differences in a measure of psychological resilience are associated with increases in both cardiovascular and noncardiovascular mortality (2). Consistent with the suggestions of Drs. Vinkers and van der Mast, we subsequently reported these individual differences in psychological resilience to be associated with healthy lifestyle choices represented by dietary intake (alcohol, fruits and vegetables, fiber, saturated fat, sodium, and sugar), smoking, and physical activity (3) and that lifestyle choices partly account for the association with mortality (4).

Our findings therefore provide some evidence that the association with major depressive disorder is specific to ischemic heart disease mortality, whereas a more general measure of self-reported mental functional health appears to be associated with both cardiovascular and cancer mortality (5). We note that past-year major depressive disorder was associated with mortality from other (noncardiovascular and noncancer) deaths (hazard ratio based on 445 deaths=2.34, 95% CI=1.44–3.79), a finding that shows some consistency with those of Drs. Vinkers et al. (6) and perhaps warrants further investigation. Finally, our study indicated that depression may encourage the adoption of a cardiotoxic lifestyle but that this is not necessarily the dominant contributor to understanding the essentially unexplained prospective association between depression and heart disease. This possibility, together with other competing hypotheses, remains to be formally tested.

1.Surtees PG, Wainwright NWJ, Luben RN, Wareham NJ, Bingham SA, Khaw KT: Psychological distress, major depressive disorder and risk of stroke. Neurology 2008; 70:788–794
 
2.Surtees PG, Wainwright NWJ, Luben R, Khaw KT, Day NE: Sense of coherence and mortality in men and women in the EPIC-Norfolk UK Prospective Cohort Study. Am J Epidemiol 2003; 158:1202–1209
 
3.Wainwright NWJ, Surtees PG, Welch AA, Luben RN, Khaw KK, Bingham SA: Healthy lifestyle choices: could sense of coherence aid health promotion? J Epidemiol Community Health 2007; 61:871–876
 
4.Wainwright NWJ, Surtees PG, Welch AA, Luben RN, Khaw KT, Bingham SA: Sense of coherence, lifestyle choices, and mortality. J Epidemiol Community Health (in press)
 
5.Myint PK, Luben RN, Surtees PG, Wainwright NWJ, Welch AA, Bingham SA, Wareham NJ, Smith RD, Harvey I, Khaw KT: Self-reported mental health-related quality of life and mortality in men and women in the European Prospective Investigation Into Cancer (EPIC-Norfolk): a prospective population study. Psychosom Med 2007; 69:410–414
 
6.Vinkers DJ, Stek ML, Gussekloo J, van der Mast RC, Westendorp RGJ: Does depression in old age increase only cardiovascular mortality? the Leiden 85-Plus Study. Int J Geriatr Psychiatry 2004; 19:852–857
 
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References

+The author’s disclosures accompany the original article.

+This letter (doi: 10.1176/appi.ajp.2008.08040523r) was accepted for publication in May 2008.

+

References

1.Surtees PG, Wainwright NWJ, Luben RN, Wareham NJ, Bingham SA, Khaw KT: Psychological distress, major depressive disorder and risk of stroke. Neurology 2008; 70:788–794
 
2.Surtees PG, Wainwright NWJ, Luben R, Khaw KT, Day NE: Sense of coherence and mortality in men and women in the EPIC-Norfolk UK Prospective Cohort Study. Am J Epidemiol 2003; 158:1202–1209
 
3.Wainwright NWJ, Surtees PG, Welch AA, Luben RN, Khaw KK, Bingham SA: Healthy lifestyle choices: could sense of coherence aid health promotion? J Epidemiol Community Health 2007; 61:871–876
 
4.Wainwright NWJ, Surtees PG, Welch AA, Luben RN, Khaw KT, Bingham SA: Sense of coherence, lifestyle choices, and mortality. J Epidemiol Community Health (in press)
 
5.Myint PK, Luben RN, Surtees PG, Wainwright NWJ, Welch AA, Bingham SA, Wareham NJ, Smith RD, Harvey I, Khaw KT: Self-reported mental health-related quality of life and mortality in men and women in the European Prospective Investigation Into Cancer (EPIC-Norfolk): a prospective population study. Psychosom Med 2007; 69:410–414
 
6.Vinkers DJ, Stek ML, Gussekloo J, van der Mast RC, Westendorp RGJ: Does depression in old age increase only cardiovascular mortality? the Leiden 85-Plus Study. Int J Geriatr Psychiatry 2004; 19:852–857
 
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