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American Journal of Epidemiology Vol. 155, No. 12 : 1144-1145
Copyright © 2002 by The Johns Hopkins University School of Hygiene and Public Health

LETTERS TO THE EDITOR

RE: "TRACKING OF CARDIOVASCULAR RISK FACTORS: THE TROMSØ STUDY, 1979–1995"

Youfa Wang and Xiaofei Wang

Department of Human Nutrition, Department of Epidemiology and Biostatistics, University of Illinois, Chicago, IL 60612
Department of Biostatistics, University of North Carolina, Chapel Hill, NC 27599

Wilsgaard et al.'s recent paper (1Go) addressed an important issue, the tracking of cardiovascular risk factors. Their study also reminds us about the current methodological difficulties in studying "tracking" and the related controversies (2GoGo–4Go). The authors followed 17,710 men and women for 16 years and found high or moderate tracking for a number of risk factors (1Go). They defined tracking as "either the stability of a certain variable over time (e.g., maintenance of a relative position . . .) or the predictability of later values from earlier measurements . . . " (1, p. 418). Several issues need to be addressed.

First, Wilsgaard et al. (1Go) used "standardized regression coefficients" (called "generalized estimating equation (GEE) tracking coefficients") to compare the tracking of different . . . [Full Text of this Article]

REFERENCES

Tom Wilsgaard, Bjarne K. Jacobsen, Henrik Schirmer, Inger Thune, Maja-Lisa Løchen, Inger Njølstad and Egil Arnesen

Department of Epidemiology and Medical Statistics, Institute of Community Medicine, University of Tromsø, N-9037 Tromsø, Norway


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Y. Wang, X. Wang, T. Wilsgaard, B. K. Jacobsen, H. Schirmer, I. Thune, M.-L. Lochen, I. Njolstad, and E. Arnesen
RE: "TRACKING OF CARDIOVASCULAR RISK FACTORS: THE TROMSO STUDY, 1979-1995"
Am. J. Epidemiol., June 15, 2002; 155(12): 1144 - 1145.
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