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 of complete clearance] 94% 50% 96% CHANCE
96% 70%
98% 90%
3) Side effects MILD MILD MILD MILD SIDE EFFECTS
(mild pain that does not disturb sleep) (Mild irritation, burning or redness) (mild pain that does not disturb sleep)
MODERATE MODERATE MODERATE SIDE EFFECTS
(pain that sometimes might 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 from their experience alternative to an hypothetical ‘surgery’) CREAM (compared with current situation)

Tinelli et al.

Tinelli et al. BMC Dermatology 2012 12:19   doi:10.1186/1471-5945-12-19

Open Data