Table 1.

Characteristics of emergency hospital admissions

Characteristic	N of admissions	Percentage of admissions	95% CI
Age
0–14	177 092	15.3	15.2 to 15.4
15–64	382 025	33.0	32.9 to 33.1
≥65	598 776	51.7	51.6 to 51.8
Gender women	547 280	47.3	47.2 to 47.3
Top 10 causes of admissions and drug poisoning (disease code)
1. Pneumonia, acute bronchitis, acute bronchiolitis (040080)	117 649	10.2	10.1 to 10.2
2. Stroke (010060)	63 931	5.5	5.5 to 5.6
3. Heart failure (050130)	32 993	2.8	2.8 to 2.9
4. Intestinal obstruction without hernia (060210)	28 701	2.5	2.5 to 2.5
5. Fracture of proximal femur (160800)	25 905	2.2	2.2 to 2.3
6. Viral enteritis (150010)	24 920	2.2	2.1 to 2.2
7. Asthma (040100)	23 858	2.1	2.0 to 2.1
8. Angina pectoris, chronic ischaemic heart disease (050050)	20 775	1.8	1.8 to 1.8
9. Disorder associated with shortened gestation period or low birth weight (140010)	20 540	1.8	1.8 to 1.8
10. Renal infection (110310)	19 853	1.7	1.7 to 1.7
41. Drug poisoning (161070a)	6748	0.6	0.6 to 0.6
Other causes	769 326	66.4	66.4 to 66.5
Comorbid mental illness	23 279	2.0	2.0 to 2.0
Deep coma	26 792	2.3	2.3 to 2.3
Ambulance services	311 333	26.9	26.8 to 27.0
Tertiary EMS	54 938	4.7	4.7 to 4.8
Surgical procedures	321 974	27.8	27.7 to 27.9
Length of stay (days)
≤3	135 096	11.7	11.6 to 11.7
4–7	266 651	23.0	23.0 to 23.1
8–14	296 549	25.6	25.5 to 25.7
15–30	258 717	22.3	22.3 to 22.4
31–60	136 014	11.7	11.7 to 11.8
≥60	64 866	5.6	5.6 to 5.6
Death during hospitalisation	78 226	6.8	6.7 to 6.8

Comorbidity of mental illness was defined as the following ICD-10 codes as comorbidities: unipolar depressive disorders (F32–F33), bipolar affective disorder (F30–F31), schizophrenia (F20–F29), alcohol use disorders (F10), drug use disorders (F11–F16 and F18–F19), post-traumatic stress disorder (F431), obsessive-compulsive disorder (F42), panic disorder (F400 and F410), or insomnia (F51). Deep coma was defined as a score on the Japan Soma Scale of 100 or more.

EMS, emergency medical services.