Table 1 Summary of coding for discrete choice experiment attributes and their levels
Attributes | Attribute levels | Variable names | ||
|---|---|---|---|---|
Surgery | Imiquimod cream | Current situation | ||
1) Cost [cost to you] | £0 | £0 | £0 | COST |
£150 | £150 | |||
£300 | £300 | |||
£500 | £500 | |||
£750 | £750 | |||
2) Chance [Chance ofcomplete clearance] | 94% | 50% | 96% | CHANCE |
96% | 70% | |||
98% | 90% | |||
3) Side effects | MILD | MILD | MILD | MILD SIDE EFFECTS |
(mild pain that doesnot disturb sleep) | (Mild irritation,burning or redness) | (mild pain that doesnot disturb sleep) | ||
MODERATE | MODERATE | MODERATE SIDE EFFECTS | ||
(pain that sometimesmight disturb sleep) | (Moderate irritation, burning,redness or weeping) | |||
SEVERE | SEVERE | (compared with severe) | ||
(pain that disturbs sleep) | (Severe irritation, burning,redness or ulceration) | |||
4) Appearance | NORMAL | NORMAL | MODERATE CHANGE | NORMAL APPEARANCE |
(Barely visible scar) | (Not discoloured skin) | (noticeable scar) | ||
MODERATE CHANGE | MODERATE CHANGE | MODERATE CHANGE IN APPEARANCE | ||
(Noticeable scar) | (Slight lightening skin) | |||
SEVERE CHANGE | SEVERE CHANGE | (compared with severe change) | ||
(Slightly raised scar) | (Discoloured skin) | |||
ALTERNATIVES | SURGERY | IMIQUIMOD CREAM | CURRENT SITUATION | SURGERY |
(fixed surgery option fromtheir experience alternativeto an hypothetical ‘surgery’) | CREAM(compared withcurrent situation) | |||