The leucocyte count: correlates and relationship to coronary risk factors: the CARDIA study

Area of Science:

• Cardiovascular Health
• Hematology
• Public Health

Background:

• The white blood cell (WBC) count is a common clinical test.
• Understanding its variations and relationship to coronary heart disease (CHD) risk factors is crucial for public health.
• Previous research has indicated potential links between WBC and CHD, but detailed correlates in young adults require further investigation.

Purpose of the Study:

• To assess the correlates of WBC count in a diverse young adult population.
• To examine the relationships between WBC count and various coronary heart disease (CHD) risk factors.

Main Methods:

• Cross-sectional study involving 4981 black and white young adults.
• Multivariate statistical adjustments were applied to analyze associations between WBC count and other variables.

Main Results:

• Mean WBC count was higher in women, white individuals, and younger age groups (18-24 years).
• WBC levels exhibited seasonal variation, peaking in autumn.
• Statistically significant direct associations with WBC included cigarette smoking, marijuana use, geographical location, birth control pill use, body mass index, pulse rate, and systolic blood pressure.
• Height, physical fitness, and high-density lipoprotein cholesterol (HDL-C) were inversely associated with WBC count.
• The inverse association between WBC and HDL-C was minimal and insufficient to explain the previously observed WBC-CHD link.

Conclusions:

• WBC count is influenced by demographic, lifestyle, and physiological factors in young adults.
• While WBC is a common clinical measure, its role as a predictor of disease, beyond being an indicator, warrants further research.
• The identified correlates provide a foundation for understanding WBC variations and their potential implications for cardiovascular health.