Fig. 1: Diagram showing patient categorization by age group and sex (left) and their association with different geomagnetic conditions (right).
From: Influence of geomagnetic disturbances on myocardial infarctions in women and men from Brazil

The planetary geomagnetic index Kp was used to classify days as geomagnetically quiet (ΣKp daily ≤24), moderate (24 <ΣKp daily ≤32), and disturbed (ΣKp daily >32). The arrow indicates the analysis of geomagnetic conditions’ influence on different population groups.