Table 4.

Characteristics of the study population.^a

Characteristics		Study population (N=168,693)
Age (years), mean (SD)		68.66 (18.96)
Gender (male), n (%)		64,002 (37.9)
Record number per person, mean (SD)		9.30 (10.90)
Cardiac arrest frequency, n (%)
	1	164,322 (97.4)
	2	4174 (2.4)
	≥3	197 (0.2)
Mortality, n (%)		87,311 (51.75)

^aContinuous variables are presented as the mean (SD), and categorical variables are presented as the number (percentage of the study population).