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Table 1 Demographics of ICU-hospital level, ventilation and surgical status: mean(SD)

From: A review of statistical estimators for risk-adjusted length of stay: analysis of the Australian and new Zealand intensive care adult patient data-base, 2008–2009

ICU hospital Overall   Not-ventilated    Ventilated  
Level/variable   Non-surgical Elective surgical Emergency surgical Non-surgical Elective surgical Emergency surgical
Rural (13.05%)  
ICU length of stay (days) 3.3 (4.6) 2.6 (3.1) 2.2 (2.6) 2.5 (3.6) 5.7(7.1) 4.7 (4.5) 5.4 (6.4)
APACHE III score 49.3(29.2) 42.6 (23.9) 36.4(16.1) 40.8 (20.8) 78.4 (33.6) 54.7 (25.3) 70.5 (30.8)
Age (years) 60.1 (19.5) 58.5 (20.4) 63.8 (16.1) 61.3 (20.5) 57.9 (18.3) 67.8 (15.1) 64.0(19.0)
% males 55 55 56 51 58 66 56
Metropolitan (18.45%)  
ICU length of stay (days) 3.7 (5.2) 3.1 (4.3) 1.8 (2.2) 2.3 (3.4) 5.7 (6.8) 4.7 (5.8) 5.3 (6.6)
APACHE III score 55.5 (30.6) 50.4 (26.3) 37.3 (16.7) 44.9 (23.6) 76.4 (34.5) 55.5 (23.1) 65.5 (29.7)
Age (years) 59.9 (19.2) 58.6 (19.9) 63.8 (16.1) 61.3 (20.5) 57.7 (19.2) 66.0 (15.2) 63.3 (19.2)
% males 55 52 58 50 56 66 59
Tertiary (44.49%)  
ICU length of stay (days) 3.9 (5.7) 3.0 (4.3) 1.5 (1.8) 2.4 (3.9) 5.9 (7.2) 2.7 (4.1) 5.5 (6.7)
APACHE III score 57.0(30.1) 51.6 (26.1) 38.7 (15.8) 45.2 (22.7) 73.4 (34.6) 48.3 (19.0) 60.8 (27.8)
Age (years) 58.3 (19.2) 57.3 (20.1) 62.8 (16.2) 59.7 (20.1) 54.6 (19.6) 64.2 (15.6) 57.9 (19.9)
% males 60 55 60 56 62 63 62
Private (24.01%)  
ICU length of stay (days) 2.4 (3.7) 3.2 (4.5) 1.5 (1.8) 1.9 (2.7) 6.6 (7.9) 3.2 (3.9) 4.5 (6.6)
APACHE III score 43.7(22.4) 49.6 (22.9) 35.3 (15.2) 40.5 (19.1) 78.1 (32.1) 52.3 (21.7) 62.48 (29.4)
Age (years) 65.5 (16.0) 68.4 (16.9) 63.4 (16.0) 64.6 (17.9) 68.9 (15.7) 68.4 (13.8) 67.9 (16.1)
% males 57 52 54 47 54 61 49