TitleLong term risk factors for coronary heart disease and stroke: influence of duration of follow-up over four decades of mortality surveillance.
Publication TypeJournal Article
Year of Publication2015
AuthorsBatty, GD, Shipley, M, Smith, GDavey, Kivimäki, M
JournalEur J Prev Cardiol
Volume22
Issue9
Pagination1139-45
Date Published09/2015
ISSN2047-4881
KeywordsAdult, Age Factors, Aged, Aged, 80 and over, Comorbidity, Coronary Disease, Follow-Up Studies, Humans, Life Style, Male, Middle Aged, Occupational Health, Population Surveillance, Proportional Hazards Models, Prospective Studies, Risk Assessment, Risk Factors, Sex Factors, Stroke, Time Factors, United Kingdom
Abstract
 

AIM: While cohort studies have revealed a range of risk factors for coronary heart disease and stroke, the extent to which the strength of these associations varies according to duration of follow-up in studies with extended disease surveillance is unclear. This was the aim of the present study.

METHODS AND RESULTS: Initiated in 1967/70, the original Whitehall study is an on-going cohort study of 15,402 male UK government workers free of coronary heart disease when they took part in a baseline medical examination during which a range of standard risk factors was measured. In analyses in which we stratified by duration of follow-up, there was evidence of time-dependency for most risk factor-disease relationships. Thus, the associations of systolic and diastolic blood pressure, total cholesterol and cigarette smoking with coronary heart disease and stroke diminished in strength with increasing duration of follow-up, whereas the magnitude of the body mass index-coronary heart disease relation was unchanged. For example, the age-adjusted hazard ratios (95% confidence interval) for cigarette smoking (versus never smoked) in relation to coronary heart disease were: 2.49 (1.80, 3.44), 1.65 (1.34, 2.03), 1.36 (1.15, 1.61) and 1.32 (1.10, 1.58) for follow-up periods 0-10, 10-20, 20-30 and 30+ years, respectively.

CONCLUSION: Despite a general diminution in the strength of effect over time, even in the fourth decade of follow-up, classic risk factors retained some predictive capacity for coronary heart disease and, to a lesser degree, stroke.

DOI10.1177/2047487314547659
Alternate JournalEur J Prev Cardiol
PubMed ID25183695
Grant List / / British Heart Foundation / United Kingdom
RG/13/2/30098 / / British Heart Foundation / United Kingdom
G0600705 / / Medical Research Council / United Kingdom
/ / Medical Research Council / United Kingdom
MR/K026992/1 / / Medical Research Council / United Kingdom
MR/K013351/1 / / Medical Research Council / United Kingdom