have been poorly studied until now. The aims of the
present study are to assess the validity and reliability
of the Indonesian version of EPDS and to find
practical recommendations of the EPDS tool
development.
2 MATERIALS AND METHODS
In this section we will explain the process, materials,
and plans of our research from the very beginning
until we examine the data.
2.1 Translation
A translation of the original EPDS into Indonesian
was followed by back-translation into English. Two
psychologists translated the questionnaire into
Indonesian and two professional translators
backward translated these into English. Then the
provisional version of the Indonesian questionnaire
was developed and pilot tested. The final version of
the questionnaire was developed after considering
few suggestions from pilot data.
2.2 Sample and Data Collection
The Indonesian version of the EPDS was
administered to mothers who had a baby under age
12 months. The samples were recruited from several
health care centres in Jakarta, Bogor and Depok
during they postnatal routine check-up or their
babies’ monthly visit to the health care. 252
mothers were included in this study. The entire
participant in this study agreed to participate with
signing the informed consent and brief explanation
of the study given to them before we delivered the
questionnaire.
2.3 Measure
The EPDS consists of 10 items and each item is
rated on a four-point scale (0 to 3), giving maximum
scores of 30. This scale covers common symptoms
of depression. It excludes somatic dimensions such
as fatigue and appetite variations which are normal
during the ante- and postnatal periods (Adouard,
Glangeaud-Freudenthal, & Golse, 2005). In short,
the 10 items measured depressive symptoms (“I
have been so unhappy that I have been crying”),
anxiety (“I have been anxious or worried for no
good reason”), and anhedonia (“I have looked
forward with enjoyment to things”). The original
EPDS has a 12.5 cut-off point that showed that score
13 and up indicates major postpartum depression,
but along the way research showed that the cut-off
point varies from one research to another, range
from 9 to 12.5. According to Cox, Holden &
Sagovsky (1987), a score from 0 to 9 indicated ‘not
depressed’, while scores of 10 to 12 represent
‘borderline’ and a score 13 or more is considered
postnatal depression.
2.4 Procedure
All subjects were recruited when coming for a
postnatal check-up or monthly visit for their baby’s
vaccination at the health care services. Each woman
was then asked by researcher to participate in this
study. After hearing the explanation about the
purpose of this study, reading the agreement and
signing a written informed consent, women who
agree to participate were asked to complete the
demographic data questionnaire and the EPDS.
2.5 Psychometric Properties
We examined content validity of the EPDS’s items
with Content Validity Index (CVI). According to
Lynn (1986), there are two types of CVIs. The first
type is content validity of individual items (I-CVI)
and the second is content validity of overall scale (S-
CVI). In order to examine CVI, three experts were
recruited to evaluate the relevance of the items and
the overall scale of Indonesian EPDS. We asked all
of the experts to rate each item’s relevance to
postpartum depression in a 4-point scale
questionnaire. Then, for each item, the I-CVI is
computed as the number of experts giving a rating of
either 3 or 4, divided by the total number of experts.
To examine the S-CVI, we are looking for the
proportion of items given a rating of quite/very
relevant by raters involved. We also measure item
validity using inter-item correlation. Reliability was
estimated by measuring internal consistency with
Cronbach’s alpha coefficient from the EPDS score.
We also performed a factor analysis of the EPDS to
investigate its internal structure.
2.6 Statistical Methods
Item validity was computed using Pearson
correlation. Internal consistency was performed
using Cronbach’s α with Statistical Package for
Social Sciences (SPSS) version 25.0 for Windows.
Confirmatory factor analysis (CFA) was conducted
using Lisrel 8.7.