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Pattern of the coronary artery disease (CAD) risk factors across body mass index (BMI) categories remains uncertain. There is a different threshold of obesity for increasing cardiovascular hazard across populations, accordingly recognition and management of obesity and overweight can guide better control of CAD epidemic in the national level. To determine the discrepancy in the prevalence of CAD risk factors across five BMI categories. A population based survey of 28566 participants recruited to medical screening of taxi drivres in Tehran (MSTDT) was designed. According to a standardized protocol data on CAD risk factors were obtained by taking medical history, examination and laboratory tests. After adjustment for age, sex, literacy, smoking, systolic blood pressure (SBP), fasting blood sugar (FBS), and LDL-C/HDL-C ratio, these CAD risk factors of diastolic blood pressure (DBP)>90 mmHg, hypertriglyceridemia, high triglyceride/ HDL-C ratio, hypercholesterolemia, and high cholesterol/HDL-C ratio were increased significantly across five incremental categories of BMI. Prevalence of DBP> 90 mmHg, hypertriglyceridemia, hyper cholesterolemia and ratios of cholesterol/ HDL-C and TG/HDL-C increased considerably across five groups of BMI. This pattern is different from previous research and our results endorsed more features of pattern of CAD risk factors across BMI categories.

More than eighty percent of patients with coronary heart diseases (CHD) have conventional risk factors. Prevalence of well known risk factors seems to show a different pattern in younger patients and individual above 55 years. To evaluate the pattern of conventional CHD risk factors in healthy individuals in two different age groups. A large scale population based survey of 31999 individuals from ten medical centers was designed. Screening of risk factors was performed upon these protocols: taking medical history, physical examination and blood tests of complete blood cell counts, fasting blood sugar, lipid profile, urinalysis and creatinine. Prevalence of the risk factors in healthy people aged above 55 years were: 8.1% for systolic blood pressure (SBP)>140 mmHg, 3.8% for diastolic blood pressure (DBP)>90mmHg, 13.9% for fasting blood glucose (FBS)≥126 Mg/dl, 36.9% for total cholesterol>200 Mg/dl, 19.2% for triglyceride (TG)>200 Mg/dl, 67.8% for HDL-c130 Mg/dl, 4.72 for TC/HDL-c ratio, 2.88 for LDL-c/HDL/c ratio and 4.24 for TG/HDL-c ratio. Prevalence of risk factors in individuals younger than 55 years were: 1.7% for SBP>140 mmHg, 1.2% for DBP>90 mmHg, 5.2% for FBS≥126 Mg/dl, 31.3% for TC>200 Mg/dl, 21.5% for TG>200 Mg/dl, 69.4% for HDL-c130 Mg/dl, 4.7 for TC/HDL-c ratio, 2.83 for LDL-c/HDL-c ratio and 4.43 for TG/HDL-c ratio. In univariate model of analysis: prevalence of the risk factors were significantly higher in age above 55 years than in people younger than 55 years except for hypertriglyceridemia and HDL-c200 Mg/dl P= 0.002, HDL-c140 mmHg P=0.001. Pattern of such a CHD risk factors of FBS≥126 Mg/dl, TG>200 Mg/dl, HDL-c140 mmHg demonstrated a statistically significant difference in the age above 55 years to the healthy people younger than 55 years. These results cab be implicated to set up prediction models for stratifying individuals at higher risk of CHD.