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Table 6 Efficiency of multi-attribute utility measures to detect differences in postnatal depression

From: Assessing the empirical validity of alternative multi-attribute utility measures in the maternity context

Measure

Categorisation of postnatal depression risk score

Utility score

t-testa

Relative efficiencyb

ROC curve

  

Mean

(SD)

t -statistic

p -value

 

Area c

95% CI

All women (n = 493)

EQ-5D

EPDS score < 13

0.885

(0.147)

4.332

<0.001

1.000

0.696*

(0.615, 0.777)

 

EPDS score ≥ 13

0.738

(0.244)

     

SF-6D

EPDS score < 13

0.830

(0.129)

7.008

<0.001

2.617

0.767*

(0.697, 0.837)

 

EPDS score ≥ 13

0.696

(0.132)

     

EQ-5D

EPDS score < 10

0.896

(0.142)

5.404

<0.001

1.000

0.679*

(0.619, 0.739)

 

EPDS score ≥ 10

0.780

(0.208)

     

SF-6D

EPDS score < 10

0.843

(0.125)

8.192

<0.001

2.298

0.749*

(0.696, 0.802)

 

EPDS score ≥ 10

0.724

(0.133)

     

Women for whom both utility scores were between 0.296 and 1.0 (n = 481)

EQ-5D

EPDS score < 13

0.891

(0.130)

3.699

<0.001

1.000

0.664*

(0.579, 0.750)

 

EPDS score ≥ 13

0.806

(0.152)

     

SF-6D

EPDS score < 13

0.833

(0.126)

6.509

<0.001

3.096

0.760*

(0.685, 0.835)

 

EPDS score ≥ 13

0.708

(0.123)

     

EQ-5D

EPDS score < 10

0.901

(0.128)

5.110

<0.001

1.000

0.662*

(0.600,

 

EPDS score ≥ 10

0.821

(0.141)

    

0.724)

SF-6D

EPDS score < 10

0.846

(0.122)

7.800

<0.001

2.330

0.743*

(0.688, 0.798)

 

EPDS score ≥ 10

0.735

(0.126)

     
  1. EPDS denotes Edinburgh Postnatal Depression Scale. SD denotes standard deviation. ROC denotes receiver operating characteristic. CI denotes confidence interval.
  2. a Not assuming equality of variance as Levene test showed statistically significant differences in variances between self-reported health status groups.
  3. b Relative efficiency statistic is referenced to 1.0 for the EQ-5D measure. A value higher than 1.0 indicates that the SF-6D is more efficient than the EQ-5D in detecting differences between women in terms of their self-reported health status.
  4. c Area under receiver operating characteristic (ROC) curves; * p < 0.05 indicates that area under the ROC curve was statistically significantly greater than 0.5 and that measure has discriminatory power.
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Health and Quality of Life Outcomes

ISSN: 1477-7525

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