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Table 2 Most common co-morbid diagnoses listed with hospitalizations for heat-stress illness in Illinois, 1984–2014. Note that percentages do not sum to 100% as hospitalized patients typically had multiple diagnoses

From: Hospitalizations for heat-stress illness varies between rural and urban areas: an analysis of Illinois data, 1987–2014

Diagnosis ICD-9 codes Frequency (percent)
Dehydration 276.5, 276.51, 276.52 3694 (42.6)
Electrolyte, acid-base abnormality 276.1, 276.2, 276.3, 276.4, 276.7, 276.8, 276.9 1445 (16.7)
Acute renal failure 584, 584.5, 584.6, 584.7, 584.8, 594.9 1021 (11.8)
Urinary tract infection 599.0 808 (9.3)
Syncope (fainting) 780.2 781 (9.0)
Rhabdomyolysis 728.88 549 (6.3)
Atrial fibrillation 427.31 514 (5.9)
Respiratory failure 518.81 299 (3.5)
Altered mental status 293.0, 780.02 92 (1.1)