Table 4

Patient preferences according to experience of BCC and treatment
With experience With no experience
Regression1 Incremental WTP (£) Their preference is for: Regression1 Incremental WTP (£) Their preferences is for:
Value (SD) Value (SD) Value (SD) Value (SD)
ASCSURGERY Coefficient 1.6300 (0.457) 488.02 - Surgery (compared with current situation) 1.3400 (0.310) 445.18 - Surgery (compared with current situation)
ASCCREAM Coefficient 2.6100 (0.719) 781.44 - Imiquimod cream (compared with current situation) 3.0500 (0.488) 1013.29 - Imiquimod cream (compared with current situation)
COST Coefficient −0.0033 (0.001) Decreased cost −0.0030 (0.001) Decreased cost
CHANCE2 Mean 0.0898 (0.033) 26.89 (44.61) Increased chance (compared with deceased; 73% of respondents) 0.1210 (0.026) 40.20 (37.54) Increased chance (compared with decreased; 86% of respondents)
SD 0.1490 (0.058) 0.1130 (0.023)
MILD SIDE EFFECTS Mean 1.1500 (0.553) 344.31 (616.77) Mild side effects (compared with severe; 71% of respondents) 1.3700 (0.390) 455.15 (541.53) Mild side effects (compared with severe; 80% of respondents)
SD 2.0600 (0.474) 1.6300 (0.327)
MODERATE SIDE EFFECTS2–3 Mean 1.1600 (0.480) 347.31 (−153.89) Moderate side effects (compared with severe; 99% of respondents) 0.6710 (0.312) 222.92 (−199.67) Moderate side effects (compared with severe; 87% of respondents)
SD 0.5140 (0.519) 0.6010 (0.423)
NORMAL APPEARANCE2-3 Mean 1.3100 (0.531) 392.22 (377.25) Normal appearance (compared with severe change; 97% of respondents) 0.9000 (0.304) 299.00 (158.80) Normal appearance (compared with severe change, 85% of respondents)
SD 1.2600 (0.633) 0.4780 (0.498)
MODERATE CHANGE IN APPEARANCE Mean 0.9230 (0.564) 276.35 (407.19) Moderate change (compared with severe; 75% of respondents) 0.4630 (0.433) 153.82 (634.55) Moderate change (compared with severe; 60% of respondents)
SD 1.3600 (0.539) 1.9100 (0.408)
No. respondents 56 118
No. observations 896 (=56 respondents*16 choices) 1869 (=115 respondents*16 choices+ 1 respondent*14 choices+1 respondent* 8 choices+1 respondent*7 choices)
Log-likelihood −649.27 −1350.8
Adj Rho-square 0.327 0.336
LR statistic 670.18 1405.08

Note: Alternative specific constants (ASC) for surgery (ASCSURGERY) and for cream (ASCCREAM) show the preferences of these alternatives relative to the current situation, everything else being equal. WTP estimates are based on the regression results in column 3 and rounded to 2 decimal places. The standard deviations are in parentheses. 1 The 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% 2 Differences in marginal WTP between groups are significant at the 95% level. 3Differences in preference distribution between groups are significant at the 99% level.

Key: SD = standard deviation, WTP = Willingness to Pay, LR = Likelihood Ratio, No. = Number of.

Tinelli et al.

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

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