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Table 1 Baseline characteristics of admitted and non-admitted patients in the derivation dataset (N = 860832)

From: The Sydney Triage to Admission Risk Tool (START) to predict Emergency Department Disposition: A derivation and internal validation study using retrospective state-wide data from New South Wales, Australia

Variable Non admitted N = 510435 AdmittedN = 350397 P value
Age (%)    <0.001
16–19 yrs 43187 (8.46) 11555 (3.30)  
20–39 yrs 217827 (42.67) 72519 (20.7)  
40–59 yrs 137922 (27.02) 82491 (23.54)  
60–79 yrs 82207 (16.11) 105495 (30.11)  
≥80 yrs 29292 (5.74) 78337 (22.36)  
Male (%) 251571 (49.29) 173218 (49.43) 0.17
Indigenous (%) 21766 (4.26) 9767 (2.79) <0.001
Nursing home (%) 3229 (0.63) 9926 (2.83) <0.001
Ambulance arrival (%) 105123 (20.59) 181714 (51.86) <0.001
Triage category (%)    <0.001
1 726 (0.14) 8606 (2.46)  
2 43046 (8.43) 95212 (27.17)  
3 156133 (30.59) 162974 (46.51)  
4 242420 (47.49) 78319 (22.35)  
5 68101 (13.34) 5285 (1.51)  
Previous ED presentation within 7 days (%) 47144 (9.24) 32956 (9.41) 0.008
Admission within 30 days 22220 (4.35) 40997 (11.70) <0.001
Hour of presentation (%)    <0.001
0800–1759 257400 (50.43) 189603 (54.11)  
1800–2259 174097 (34.11) 106963 (30.53)  
2300–0759 78938 (15.46) 53831 (15.36)  
Presenting problem type (%)    <0.001
Abdominal, gastrointestinal 63630 (12.47) 60845 (17.36)  
Cardiovascular 45068 (8.83) 54968 (15.69)  
General symptoms 43702 (8.56) 37027 (10.57)  
Febrile illness 11460 (2.25) 14522 (4.14)  
Injury 106890 (20.94) 42736 (12.20)  
Respiratory 19370 (3.79) 32264 (9.21)  
Musculoskeletal 57727 (11.31) 20157 (5.75)  
Neurological 30750 (6.02) 32569 (9.29)  
Mental health 24020 (4.71) 15859 (4.53)  
Toxicological 4893 (0.96) 4150 (1.18)  
ENT/eye/head and neck 35014 (6.86) 5277 (1.51)  
Administrative 18589 (3.64) 4282 (1.22)  
Genitourinary 16318 (3.20) 11864 (3.39)  
Social 302 (0.06) 310 (0.09)  
Endocrine 1133 (0.22) 1903 (0.54)  
Obstetrics, Gynaecology 14124 (2.77) 3675 (1.05)  
Skin, allergy 17253 (3.38) 7041 (2.01)  
Other medical 192 (0.04) 948 (0.27)