Table 5 Ranked importance of variables from backward elimination in Cox model compared to minimal depth from random survival forest, for prediction of TKA revision. Variables are displayed in decreasing order of importance
Bootstrap backwards elimination in Cox model (95% CI) | Minimal depth from random survival forest (95% CI) | ||
|---|---|---|---|
Age | 1 (1,1) | Age | 1.54 (1.45,1.64) |
Pain | 2.26 (2.21,2.3) | Pain | 1.91 (1.8,2.02) |
Patella usage | 2.92 (2.86,2.97) | Patella usage | 2.04 (1.93,2.15) |
Stability | 4.39 (4.34,4.44) | Depression | 2.2 (2.08,2.32) |
Bearing surface | 4.51 (4.43,4.59) | Bearing surface | 2.46 (2.34,2.58) |
Depression | 6.22 (6.17,6.28) | Stability | 2.79 (2.68,2.9) |
Sex | 7.39 (7.32,7.46) | Mobility | 3.05 (2.91,3.18) |
Tibial cement | 8.8 (8.62,8.98) | Anxiety | 3.05 (2.91,3.19) |
Anxiety | 10.6 (10.44,10.77) | Sex | 3.24 (3.13,3.35) |
Ischaemic heart disease angina | 10.68 (10.48,10.87) | Tibial cement | 3.49 (3.36,3.62) |
Mobility | 10.77 (10.6,10.95) | Inflammation pain | 4.2 (4.07,4.33) |
Gastro-oesophageal reflux disease | 11.02 (10.81,11.23) | Ischaemic heart disease angina | 4.2 (4.09,4.32) |
Steroid responsive diseases | 12.48 (12.27,12.7) | Steroid responsive diseases | 4.23 (4.11,4.35) |
Computer navigation | 16.48 (16.22,16.74) | Gastro-oesophageal reflux disease | 4.28 (4.15,4.41) |
congestive heart failure | 16.89 (16.5,17.28) | Hypertension | 4.47 (4.35,4.6) |
Arrhythmia | 17.1 (16.74,17.46) | Ischaemic heart disease hypertension | 4.68 (4.56,4.8) |
Ischaemic heart disease hypertension | 18.62 (18.29,18.95) | Computer navigation | 4.73 (4.62,4.83) |
Hypothyroidism | 19.16 (18.82,19.5) | congestive heart failure | 4.74 (4.63,4.84) |
Hypertension | 19.39 (19.02,19.76) | Gout | 4.74 (4.64,4.84) |
Osteoporosis/Paget’s | 19.88 (19.53,20.23) | Chronic Airways Disease | 4.78 (4.66,4.9) |
Anticoagulants | 21.74 (21.37,22.12) | Femoral cement | 4.86 (4.74,4.98) |
Inflammation pain | 22.09 (21.76,22.42) | Glaucoma | 4.93 (4.81,5.05) |
Chronic Airways Disease | 22.96 (22.61,23.31) | Anticoagulants | 4.93 (4.82,5.04) |
Diabetes | 23.9 (23.58,24.22) | Osteoporosis/Paget’s | 5.1 (4.99,5.21) |
Hyperlipidaemia | 24.12 (23.82,24.41) | Arrhythmia | 5.11 (5,5.21) |
Antiplatelet medication | 24.28 (23.96,24.6) | Diabetes | 5.17 (5.07,5.27) |
Gout | 24.86 (24.59,25.14) | Antiplatelet medication | 5.18 (5.07,5.29) |
Glaucoma | 25.23 (24.95,25.52) | Hypothyroidism | 5.19 (5.1,5.29) |
Femoral cement | 25.24 (24.97,25.51) | Hyperlipidaemia | 5.26 (5.16,5.36 |