The incidence of coronary heart disease and the population attributable fraction of its risk factors in Tehran: a 10-year population-based cohort study.

Multivariable analysis based on the Weibull model showed a shape parameter ( p ) of 1.7 (95% CI, 1.5–1.8) in men and 1.7 (1.5–2.0) in women indicating that the hazard increases over the time; it also indicated a borderline significant effect of low HDL cholesterol on CHD outcome and significant effects for other risk factors, except smoking in women ( Table 3 ).

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The borderline significance of risk of low HDL-C among our population might be related to the inappropriate cut off point or lack of variation of this risk factor among our population [10] .

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