Skip to main content

Table 4 Hospital and patient variables as predictors of 30-day mortality after discharge across all patients (n = 129,923)

From: Association between the bed-to-nurse ratio and 30-day post-discharge mortality in patients undergoing surgery: a cross-sectional analysis using Korean administrative data

VariableCategoriesOdds Ratio95% Confidence Intervalp
Hospital variables
Hospital typeTertiary hospital1.250.98–1.58.067
Secondary hospital1.00  
Hospital ownershipPublic sector1.060.72–1.58.764
Educational foundation1.340.92–1.96.124
Medical or other corporation1.270.88–1.82.197
Private corporation1.00  
Hospital locationSeoul0.980.78–1.23.851
Metropolitan cities0.950.79–1.14.600
Small and medium-sized cities1.00  
Bed-to-physician ratio1.020.99–1.05.189
Bed-to-nurse ratiosLevel 1 (Less than 2.5)0.620.39–0.99.044
Level 2 (2.5–3.4)0.630.42–0.94.023
Level 3 (3.5–4.4)0.730.44–1.21.219
Level 4 (4.5 or greater)1.00  
Patient variables
Age, years1.041.04–1.05< .001
SexMale1.401.22–1.60< .001
Female1.00  
Type of surgeryMajor craniotomy except for trauma1.661.21–2.28.002
Other craniotomy except for trauma1.621.15–2.27.005
Craniotomy for trauma0.730.53–1.03.072
Cardiac valve procedure with cardiac catheter0.760.43–1.33.334
Cardiac valve procedure without cardiac catheter0.640.36–1.13.123
Coronary bypass with/without cardiac catheter0.660.41–1.04.076
Major reconstructive vascular procedure2.401.46–3.93.001
Amputation for circulatory system disorders1.300.76–2.24.342
Esophageal procedure1.240.74–2.08.410
Major small and large bowel procedure0.420.29–0.62< .001
Stomach and duodenal procedure0.700.53–0.93.015
Pancreas, liver and shunt procedure1.00  
Comorbidities or complicationsNone0.380.26–0.55< .001
Minor1.090.77–1.53.637
Moderate1.571.12–2.19.009
Severe1.00  
Type of health insuranceSelf-employed beneficiary0.530.32–0.89.017
Self-employed dependent0.840.48–1.48.554
Employed beneficiary0.430.25–0.72.002
Employed dependent0.620.37–1.04.069
Medical Aid beneficiary0.970.54–1.77.929
Medical Aid dependent1.00  
Admission routeEmergency department2.732.33–3.21< .001
Outpatient department1.00