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Table 3 Patient preferences for the whole sample (n=174)

From: What determines patient preferences for treating low risk basal cell carcinoma when comparing surgery vs imiquimod? A discrete choice experiment survey from the SINS trial

  

Whole sample

  

Regression1

IncrementalWTP2 (£)

Their preference is for:

  

Value

(SD)

Value

(SD)

 

ASC SURGERY

Coefficient

1.4200

(0.253)

458.06

-

Surgery (compared with current situation)

ASC CREAM

Coefficient

2.8700

(0.398)

925.81

-

Imiquimod cream (comparedwith current situation)

COST

Coefficient

−0.0031

(0.000)

-

-

Decreased cost

CHANCE

Mean

0.1090

(0.018)

35.16

(38.71)

increased chance, 82% of respondents

 

SD

0.1200

(0.022)

   

MILD SIDE EFFECTS

Mean

1.3800

(0.314)

445.16

(541.94)

mild side effects (comparedwith severe, 79% of respondents)

 

SD

1.6800

(0.282)

   

MODERATE SIDE EFFECTS

Mean

0.8390

(0.265)

270.65

(199.68)

moderate side effects (compared withsevere, 91% of respondents)

 

SD

0.6190

(0.396)

   

NORMAL APPEARANCE

Mean

1.0200

(0.265)

329.03

(267.74)

normal appearance (compared withsevere change, 89% of respondents)

 

SD

0.8300

(0.333)

   

MODERATE CHANGEIN APPEARANCE

Mean

0.5400

(0.345)

174.19

(548.39)

moderate change (compared withsevere change, 62% of respondents)

 

SD

1.7000

(0.274)

   

Number of respondents

 

174

Number of observations

 

2765 (=171 respondents *16 choices +1respondents*14 choices+1 respondent*8 choices+1 respondent*7 choices)

Log-likelihood

 

−2013.9

Adjusted Rho-square

 

0.333

LR statistic

 

2047.47

  1. 1The preferred model is a MLM and presents all characteristics (apart from ‘COST’, ‘ASCSURGERY’, ‘ASCCREAM’) as random and independently normally distributed. The simulation process is based on 500 draws. All coefficients (either fixed or random) and the standard deviations of the random coefficients are statistically significant at 95%. 2WTP estimates are based on the regression results in column 3 and rounded to 2 decimal places. The standard deviations are in parentheses. Marginal WTP for a unit change in a treatment characteristic = (mean coefficient of characteristic)/-(coefficient ‘COST’), with SD = (SD of characteristic coefficient)/-(coefficient ‘COST’).
  2. Note: Alternative specific constants (ASC) for surgery (ASC SURGERY) and for cream (ASC CREAM) show the preferences of these alternatives relative to the current situation, everything else being equal.
  3. Key: SD = standard deviation, WTP = Willingness to Pay, LR = Likelihood Ratio.
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BMC Dermatology

ISSN: 1471-5945

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