Table 1: Patient demographic, admission, mortality and discharge characteristics across Body Mass Index (BMI) categories.

Underweight(BMI < 18.5), N = 33 Extremely obese (BMI ≥ 40),N = 15 All other categories(BMI 18.5 ≤ 40),N = 362 p-value
Age, mean years (SD) 69 (19) 55 (14) 64 (18) 0.06
Female, n (%) 22 (67) 9 (60) 152 (42) 0.01

Clinical specialty on admission, n (%)^

Cardiology/Cardiothoracic

• General Medicine

• General surgery

• Neurology/Neurosurgery

• Orthopaedics/Rehabilitation

• Other

 

6 (12)

15 (31)

7 (15)

4 (8)

7 (15)

9 (19)

 

45 (12.5)

74 (20)

64 (18)

58 (16)

45 (12.5)

76 (21)

0.49

Length of stay, median days (range) 10 (2-63) 16 (2-39) 9.5 (1-246) 0.94

Mortality, n (%)

• During hospital admission

• 28-day

• 1-year

 

3 (9)

1 (3)

6 (21)

 

0

0

3 (20)

 

N/A

N/A

N/A

N/A

Discharge destination, n (%)^

• Home or usual place of care

• Other hospital

• In-hospital death

 

37 (77)

8 (17)

3 (6)

 

282 (78)

69 (19)

11 (3)

0.33

Survivor's re-admitted to hospital, n (%)

• 28-day

• 1-year (one admission)

• 1-year (multiple admissions)

 

5 (17)

12 (52)

8 (35)

 

3 (20)

6 (50)

4 (33)

 

31 (8.6)*

N/A

N/A

^Fisher's exact analysis performed as underweight/extremely obese vs. other BMI; *Number estimated from Australian Health Roundtable data for this hospital [11].