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This Article Full Text Full Text (PDF) All Versions of this Article: AJPH.2007.119370v1 97/11/1928    most recent Submit a response Purchase Article View Shopping Cart Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Kivimäki, M. Articles by Vahtera, J. Search for Related Content PubMed Articles by Kivimäki, M. Articles by Vahtera, J. Related Collections Socioeconomic Factors Cardiovascular Disease

Mika Kivimäki, PhD, Debbie A. Lawlor, PhD, George Davey Smith, DSc, Anne Kouvonen, PhD, Marianna Virtanen, PhD, Marko Elovainio, PhD and Jussi Vahtera, MD, PhD

Mika Kivimäki is with the Department of Epidemiology and Public Health, University College London, London, England. Debbie A. Lawlor and George Davey Smith are with the Department of Social Medicine, University of Bristol, Bristol, England. Anne Kouvonen is with the Institute of Work, Health & Organisations, University of Nottingham, Nottingham, England. Marko Elovainio is with the National Research and Development Centre for Welfare and Health, Helsinki, Finland. Marianna Virtanen and Jussi Vahtera are with the Finnish Institute of Occupational Health, Helsinki.

Correspondence: Requests for reprints should be sent to Mika Kivimäki, Department of Epidemiology and Public Health, University College London, 1–19 Torrington Place, London WC1E 6BT, UK (e-mail: m.kivimaki@ucl.ac.uk).

	Because this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

We welcome Ljung and Hallqvist’s evidence from the Stockholm Heart Epidemiology Program (SHEEP) case-control study¹ and confirm that they picked up a typographical error in our Table 2 (they are correct that the number should be 213 and not 283), the analyses being based on correct figures.² Studies suggest a greater number of risk factors for coronary heart disease (CHD) are present in low than in high socioeconomic groups, but a reasonably similar clustering of risk factors within these groups.^1–3 However, evidence for the latter, although consistent, is still scarce.

Why bother to study risk clustering? This is an attempt . . . [Full Text]