Injury mortality and accessibility to emergency care in Japan: an observational epidemiological study

Figures & data

Table 1 Demographic statistics of municipalities (N=1,742)

	Median (interquartile range)
Population
Overall population	25,161.5 (7,943–65,840)
Population aged ≥65 years	6,788.0 (2,411–15,792)
Proportion of those aged ≥65 years	27.0 (22.4–31.9)
Accessibility time to an emergency	34.5 (20.4–58.2)
hospital, minutes
Death due to unintentional injuries
Number of deaths in 5-year period	52 (22–113)
Mortality per 1,000 population in 5-year period	1.9 (1.3–2.5)

Table 2 Mortality rate and proportion of elderly in population by accessibility time

Accessibility time	Municipality^a	Mortality^b	Elderly^Table Footnotec·
< 15 minutes	246 (15.0)	1.4	22.6
15–30 minutes	465 (28.3)	1.7	23.9
30–45 minutes	328 (19.9)	2.0	27.6
45–60 minutes	221 (13.4)	2.2	29.2
60–90 minutes	227 (13.8)	2.2	31.7
>90 minutes	158 (9.6)	2.2	33.0

Notes: ^an (%);

b the number of deaths per 1,000 in 5 years;

c >65 years (%).

Figure 1 Correlation between accessibility time and mortality due to unintentional injuries in all municipalities.

Figure 2 Age-adjusted mortality due to unintentional injuries in municipalities, categorized by accessibility time.

Notes: Box graph for each group: <15 minutes; 15–30 minutes; 30–45 minutes; 45–60 minutes; 60–90 minutes; >90 minutes. ^aMortality in group 1 was significantly lower than that in groups 2–6 (P<0.05, analysis of covariance adjusted for age); ^bmortality in group 2 was significantly lower than that in groups 3–6 (P<0.05, analysis of covariance adjusted for age); ^cmortality in group 3 was significantly lower than that in group 5 (P<0.05, analysis of covariance adjusted for age).