Table 1 Attributes and levels included in the discrete choice experiment
Attributes | Levels |
|---|---|
Pain outcomes: | |
 1. Day-time pain 9–12 months after surgery | No day-time pain, moderate day-time pain, severe day-time pain |
 2. Night-time pain 9–12 months after surgery | No night-time pain, moderate night-time pain, severe night-time pain |
Functional outcomes: | |
 3. Standing and walking on a flat surface 9–12 months after surgery | No difficulty standing and walking; |
Moderate difficulty standing and walking, severe difficulty standing and walking | |
 4. Bending to floor, rising from sitting, going up and down stairs 9–12 months after surgery | No difficulty bending to floor, rising from sitting, going up and down stairs |
Moderate difficulty bending to floor, rising from sitting, going up and down stairs | |
Severe difficulty bending to floor, rising from sitting, going up and down stairs | |
Risk of complications: | |
 5. Risk of having to go back into hospital and have a second operation on your knee | 0 %, 7 %, 13 % |
 6. Risk of getting a complication that requires seeing GP or specialist for further treatment | 0 %, 10 %, 21 % |