Table 1. Documented causes of cardiac arrest in the German Resuscitation Registry and classification for analysis in this study.

Documented cause (Utstein style)	Classification for analysis
– Cardiac – Other/unknown	– Cardiac, other, and unknown
– Trauma – Massive bleeding	– Trauma and bleeding to death
–  Hypoxia	– Hypoxia
– Drowning	–  Drowning
– Intoxication	–  Intoxication
– Intracranial bleeding (including subarachnoid hemorrhage) –Apoplexy (ischemic)	– Central nervous system disorders
– Sepsis	– Sepsis
– Sudden infant death syndrome – Metabolic	Excluded due to low case numbers