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Table 6 Ranked importance of variables from backward elimination in Cox model compared to minimal depth from random survival forest, for prediction of THA revision. Variables are displayed in decreasing order of importance

From: A comparison of survival models for prediction of eight-year revision risk following total knee and hip arthroplasty

Bootstrap backwards elimination in Cox model (95% CI)

Minimal depth from random survival forest (95% CI)

Femoral cement

1.46 (1.43,1.49)

Femoral cement

0.66 (0.62,0.7)

Depression

1.92 (1.87,1.98)

Depression

0.99 (0.93,1.04)

Pain

2.82 (2.76,2.89)

Pain

1.5 (1.44,1.55)

Gastro-oesophageal reflux disease

5.33 (5.19,5.46)

Gastro-oesophageal reflux disease

2.44 (2.36,2.51)

Sex

5.58 (5.49,5.67)

Sex

2.7 (2.65,2.76)

Age

7.49 (7.32,7.67)

Steroid responsive diseases

2.77 (2.69,2.85)

Steroid responsive diseases

8.29 (8.06,8.52)

Age

3.1 (3.05,3.15)

Inflammation pain

8.96 (8.79,9.13)

Congestive heart failure

3.25 (3.18,3.32)

Anxiety

9.74 (9.53,9.95)

Anxiety

3.64 (3.55,3.74)

Congestive heart failure

12.22 (11.93,12.5)

Bearing Surface

3.74 (3.67,3.81)

Osteoporosis/Paget’s

12.22 (11.98,12.46)

Head size

3.88 (3.83,3.94)

Head size

12.23 (11.97,12.49)

Osteoporosis/Paget’s

3.93 (3.84,4.02)

Bearing surface

12.32 (12.1,12.55)

Gout

4.18 (4.1,4.26)

Hyperlipidaemia

12.37 (12.19,12.54)

Inflammation pain

4.32 (4.23,4.41)

Anticoagulant

15.47 (15.18,15.76)

Acetabular cement

4.33 (4.26,4.41)

Hypothyroidism

16.74 (16.48,17)

Hyperlipidaemia

4.6 (4.51,4.69)

Chronic Airways Disease

17.61 (17.34,17.88)

Chronic Airways Disease

4.78 (4.69,4.87)

Gout

19.13 (18.86,19.4)

Anticoagulants

4.95 (4.85,5.04)

Arrhythmia

19.92 (19.64,20.2)

Arrhythmia

5.05 (4.95,5.15)

Ischaemic heart disease hypertension

20 (19.76,20.23)

Hypothyroidism

5.28 (5.19,5.38)

Antiplatelet medications

21.3 (21.09,21.52)

Ischaemic heart disease angina

5.32 (5.22,5.43)

Glaucoma

21.4 (21.2,21.6)

Hypertension

5.48 (5.38,5.58)

Diabetes

21.53 (21.33,21.74)

Ischaemic heart disease hypertension

5.55 (5.46,5.64)

Ischaemic heart disease angina

21.62 (21.42,21.82)

Antiplatelet medications

5.57 (5.47,5.67)

Acetabular cement

21.64 (21.45,21.84)

Diabetes

5.74 (5.64,5.85)

Hypertension

21.69 (21.48,21.89)

Glaucoma

6.11 (6,6.21)