Skip to main content

Table 8 Spearman correlation coefficient between quality of life according to different methods of measurement.

From: Measuring melasma patients' quality of life using willingness to pay and time trade-off methods in thai population

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

    

-

  1. Where:
  2. DLQI = total score of Dermatology Life Quality Index
  3. Standard TTO = Quality of life measured by the standard Time Trade Off method
  4. Daily TTO = Quality of life measured by the daily Time Trade Off method
  5. WTP = Monthly Willingness To Pay (baht/month)
  6. WTP/INC = Impact on quality of life measured by the Willingness To Pay method (monthly WTP/monthly income).
Back to article page

BMC Dermatology

ISSN: 1471-5945

Contact us