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* |