The month and season of birth have been found to be associated with cardiovascular mortality, but the mechanisms are not fully explained. We planned a study to examine the relationship between SYNTAX score, which shows the severity of coronary artery disease (CAD), and the month and season of birth. 346 patients who underwent coronary angiography between October 2019 and January 2020 were evaluated. Birth month, birth seasons and demographic data of patients were recorded. SYNTAX scores were calculated from patients' coronary angiographies. Patients with birth months September, October, November and December had the lowest SYNTAX score (6.42±8.78, 5.61±8.42, 8.93±12.07, 6.35±8.02, respectively). SYNTAX score of patients who were born in October was statistically significantly lower compared to other months (p= 0.005). Coronary artery disease was highest in those born in June (%81.2) and July (%82.6). The presence of CAD in patients born in fall was 46.5% (p
Key words: Birth month, birth season, coronary artery disease, SYNTAX score
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