Table 3 Hypothetical examples of combined data within scenarios
Arthroplasty | Assessed outcome | Effect of age | Effect of BMI | Effect of preoperative status | Total effect on postoperative outcome (points)a |
|---|---|---|---|---|---|
Scenario 1: A patient loses weight (X points) and increases preoperative status by Y points, this takes Z years | |||||
 X, Y, Z = 5 (e.g. in 5 years BMI decreases from 30 to 25, KOOS HRQoL/ functioning/ pain increases from 35 to 40) | |||||
  TKA | HRQoL | 0 | 0 | 5*0.51 | 2.6 |
Functioning | 0 | 0 | 5*0.31 | 1.6 | |
Pain | 0 | 5*0.47 | 5*0.18 | 3.3 | |
  THA | HRQoL | 5*−0.08 | 5*0.23 | 5*0.37 | 2.6 |
Functioning | 5*−0.33 | 5*0.35 | 5*0.22 | 1.2 | |
Pain | 5*−0.18 | 5*0.36 | 5*0.15 | 1.7 | |
 X, Y, Z = 10 (e.g. in 10 years BMI decreases from 35 to 25, KOOS HRQoL/ functioning/ pain increases from 35 to 45) | |||||
  TKA | HRQoL | 0 | 0 | 10*0.51 | 5.1 |
Functioning | 0 | 0 | 10*0.31 | 3.1 | |
Pain | 0 | 10*0.47 | 10*0.18 | 6.5 | |
  THA | HRQoL | 10*−0.08 | 10*0.23 | 10*0.37 | 5.2 |
Functioning | 10*−0.33 | 10*0.35 | 10*0.22 | 2.4 | |
Pain | 10*−0.18 | 10*0.36 | 10*0.15 | 3.3 | |
Scenario 2: A patient gains weight (X points) and decreases preoperative status by Y points, this takes Z years | |||||
 X, Y, Z = 5 (e.g. in 5 years BMI increases from 25 to 30, HOOS HRQoL/ functioning/ pain decreases from 40 to 35) | |||||
  TKA | HRQoL | 0 | 0 | 5*−0.51 | −2.6 |
Functioning | 0 | 0 | 5*−0.31 | −1.6 | |
Pain | 0 | 5*−0.47 | 5*−0.18 | −3.3 | |
  THA | HRQoL | 5*−0.08 | 5*−0.23 | 5*−0.37 | −3.4 |
Functioning | 5*−0.33 | 5*−0.35 | 5*−0.22 | −4.5 | |
Pain | 5*−0.18 | 5*−0.36 | 5*−0.15 | −3.5 | |
 X, Y, Z = 10 (e.g. in 10 years BMI increases from 25 to 35, HOOS HRQoL/ functioning/ pain decreases from 45 to 35) | |||||
  TKA | HRQoL | 0 | 0 | 10*−0.51 | −5.1 |
Functioning | 0 | 0 | 10*−0.31 | −3.1 | |
Pain | 0 | 10*−0.47 | 10*−0.18 | −6.5 | |
  THA | HRQoL | 10*−0.08 | 10*−0.23 | 10*−0.37 | −6.8 |
Functioning | 10*−0.33 | 10*−0.35 | 10*−0.22 | −9.0 | |
Pain | 10*−0.18 | 10*−0.36 | 10*−0.15 | −6.9 | |