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Confounding effect of socioeconomic position in the study of height in relation to prostate cancer risk

British Journal of Cancer
Nature Publishing Group
Publication Date
DOI: 10.1038/sj.bjc.6601799
  • Letter To The Editor
  • Ecology
  • Economics
  • Education
  • Geography


Letter to the Editor Confounding effect of socioeconomic position in the study of height in relation to prostate cancer risk GD Batty*,1 1Department of Social Medicine, Panum Institute, University of Copenhagen, Blegdamsvej 3, DK-2200 Copenhagen N, Denmark British Journal of Cancer (2004) 90, 1875. doi:10.1038/sj.bjc.6601799 Published online 6 April 2004 & 2004 Cancer Research UK � � � � � � � � � � � � � � � � � Sir, In their report, Engeland et al (2003) examined height (an indicator of genetic and early life environmental factors) and body mass index (an indicator of overweight) in relation to prostate cancer, finding an elevated risk in men of tall stature and of overweight. While the study offers high power (a total of 33 314 verified cases in a cohort of almost one million men), there was an absence of any collateral data. Both height and overweight are socially patterned, with the highest proportion of taller and leaner adult individuals among the more affluent (Batty and Leon, 2002). Socioeconomic position is also associated with prostate cancer mortality, generally with an elevated risk in the higher social groups (Davey Smith et al, 1991; Pukkala and Weiderpass, 2002). This raises the question of whether socioeconomic differences in height and overweight may be an alternative explanation for their apparent relation with prostate cancer risk. While recent evidence suggests this is not the case for overweight in relation to prostate cancer (Calle et al, 2003), two studies (Leon et al, 1995; Nilsen and Vatten, 1999) that explored the predictive value of height for this malignancy found that the magnitude of the association was attenuated following control for social factors which included educational attainment and occupational social class. All observa- tional studies are hampered by some methodological short- coming; however, confounding by socioeconomic position is important in the study of cancer aetiology, and may explain the apparent protective ef

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