|
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)
| | | | | |
- EPDS denotes Edinburgh Postnatal Depression Scale. SD denotes standard deviation. ROC denotes receiver operating characteristic. CI denotes confidence interval.
-
a Not assuming equality of variance as Levene test showed statistically significant differences in variances between self-reported health status groups.
-
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.
-
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.
