Fig. 4: Hospital admissions due to myocardial infarction (MI) by sex, age groups, and under different geomagnetic conditions - absolute counts and relative frequencies.
From: Influence of geomagnetic disturbances on myocardial infarctions in women and men from Brazil

Absolute count (a) and relative frequency (b) of hospital admissions for myocardial infarction (MI) on days classified as geomagnetically quiet, moderate, and disturbed, stratified by sex (male and female) and age group (≤30 years, >30 and ≤60 years, >60 years). Blue bars indicate geomagnetically quiet days, green bars moderate geomagnetic activity days, and red bars geomagnetically disturbed days. Panel (a) refers to the total admission count (n = 1340), while panel (b) displays the daily admission proportion (%).