Editor—Macleod et al's paper on stress and cardiovascular disease tells us two things.1 Firstly, the Rose angina questionnaire rather inconveniently does not just measure angina in the sense understood by cardiologists.2 Instead it measures chest pain as understood by everyone else.
Most cases of chest pain in the general population are not due to heart disease, and even in middle aged Scottish men the prevalence of coronary heart disease is low, so the positive predictive value of the Rose questionnaire will be poor.3 The relation between stress and chest pain that the questionnaire measures is only a “bias” in as much as it does not fit into the view of cardiovascular epidemiologists. The effect is real (and has important clinical implications to cardiologists) in that the Rose questionnaire is a superb measure of anxiety in young people but will mislead those who interpret its results too credulously.3 The effect probably accounts for anomalies such as the higher rates of angina in women despite their lower rates of coronary heart disease.4
The second thing the paper tells us is that a weak measure of stress is a poor predictor of cardiovascular events many years later. Contrary to the statement in “This week in the BMJ,” the findings of the study do not do much to “cast doubt over the associations between psychosocial measures and disease outcomes.”
Many studies indicate a higher mortality for people with depression and other psychiatric disorders.5 Though there may be important residual confounders (or explanatory pathways) to explain these effects, they still need explaining.
References
- 1.Macleod J, Davey Smith G, Heslop P, Metcalfe C, Carroll D, Hart C, et al. Psychological stress and cardiovascular disease: empirical demonstration of bias in a prospective observational study of Scottish men. (With commentary by J Lynch) BMJ. 2002;324:1247–1251. doi: 10.1136/bmj.324.7348.1247. . (Page range includes article and commentary.) (25 May.) [DOI] [PMC free article] [PubMed] [Google Scholar]
- 2.Rose G, McCartney P, Reid DD. Self-administration of a questionnaire on chest pain and intermittent claudication. Br J Prev Soc Med. 1977;31:42–48. doi: 10.1136/jech.31.1.42. [DOI] [PMC free article] [PubMed] [Google Scholar]
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- 4.Harris RB, Weissfeld LA. Gender differences in the reliability of reporting symptoms of angina pectoris. J Clin Epidemiol. 1991;44:1071–1078. doi: 10.1016/0895-4356(91)90009-x. [DOI] [PubMed] [Google Scholar]
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