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Table 1 Patient characteristics and neighborhood environment in each population-density area

From: Population density, call-response interval, and survival of out-of-hospital cardiac arrest

Population density (/km2) Very low (<250) Low (250-999) Middle-low (1,000-2,999) Middle-high (3,000-5,999) High (6,000-9,999) Very high (≥10,000) p
   No. of patients 5,605 14,870 23,057 21,702 16,193 19,860  
   Sex (males) 62.6% 61.9% 61.6% 61.7% 61.6% 61.3% 0.587*
   Age (Average ± SD, yrs) 73.2 ± 17.0 72.9 ± 17.6 72.2 ± 17.7 71.6 ± 17.8 70.8 ± 18.1 70.5 ± 18.1 <0.001**
   Cardiac origin (%) 53.6% 53.6% 54.0% 55.2% 57.2% 58.0% <0.001*
   Occurrence of bystander-initiated CPR 46.4% 45.3% 44.2% 42.8% 41.4% 36.3% <0.001*
   Occurrence of AED use 0.55% 0.35% 0.52% 0.48% 0.59% 0.85% <0.001*
   The proportion of neighborhood elderly people aged ≥65 yrs 25.6% 24.6% 21.9% 20.5% 18.6% 18.1% <0.001*
  1. CPR: cardiopulmonary resuscitation, AED: automated external defibrillators, SD: standard deviation. *Chi-square tests **Analysis of variance