Table 8

Spearman correlation coefficient between quality of life according to different methods of measurement.

Correlation

DLQI

Standard TTO

Daily TTO

WTP/INC

WTP


DLQI

Coefficient

1

0.107

-0.176

0.240

0.226

p value

-

0.352

0.122

0.035

0.047

Standard TTO

Coefficient

1

0.266

0.009

0.150

p value

-

0.019

0.936

0.191

Daily TTO

Coefficient

1

-0.134

0.087

p value

-

0.241

0.448

WTP/INC

Coefficient

1

0.504

p value

-

0.000*

WTP

Coefficient

1

p value

-


Where:

DLQI = total score of Dermatology Life Quality Index

Standard TTO = Quality of life measured by the standard Time Trade Off method

Daily TTO = Quality of life measured by the daily Time Trade Off method

WTP = Monthly Willingness To Pay (baht/month)

WTP/INC = Impact on quality of life measured by the Willingness To Pay method (monthly WTP/monthly income).

Leeyaphan et al. BMC Dermatology 2011 11:16   doi:10.1186/1471-5945-11-16

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