Using the WHO Self-Reporting Questionnaire-20 (SRQ-20) to Detect Symptoms of Common Mental Disorders among Pregnant Women in Vietnam: a Validation Study

Figures & data

Table 1 Characteristics of the Participants (n=210)

Characteristics
Age, mean (SD)	28.9 (6.3)
Rural, n (%)	208 (99.0)
Married, n (%)	209 (99.5)
Gestational period, n (%)
First trimester	53 (25.2)
Second trimester	85 (40.5)
Third trimester	72 (34.3)
Education, n (%)
Primary school	8 (3.8)
Secondary school	52 (24.8)
High school	104 (49.5)
Above high school	46 (21.9)
Occupation, n (%)
Have work	180 (85.7)
Study	2 (1.0)
Housewife	24 (11.4)
No job	4 (1.9)
Perceived social status
Mean (SD)	5.4 (1.6)
Median (IQR)	5 (5; 6)
Have a family history related to mental health problems, n (%)	8 (3.8)
Having been diagnosed with mental health problems, n (%)	2 (1.0)
Having planned pregnancy, n (%)	109 (51.9)

Table 2 EFA Factor Loadings for the SRQ-20

Item Number	Items	Factor Loading
Factor 1
1	Having headaches	0.86
2	Poor appetite	0.82
3	Difficult sleeping	0.69
5	Hand shaking	0.76
7	Poor digestion	0.72
19	Having uncomfortable feelings in the stomach	0.63
Factor 2
4	Being easily frighted	0.83
6	Feeling nervous, tense or worried	0.85
9	Feeling unhappy	0.77
10	Crying more than usual	0.80
Factor 3
8	Having trouble thinking clearly	0.75
11	Finding it difficult to enjoy one’s daily activities	0.63
12	Difficult to make desicion	0.58
13	Suffering daily work	0.70
18	Feeling tired all the time	0.63
20	Being easily tired	0.63
Factor 4
14	Being unable to play a useful part in life	0.89
15	Having lost interest in things	0.69
16	Feeling being a worthless person	0.80
17	Having the thought of ending one’s life	0.79

Figure 1 ROC curve of the SRQ-20.

Abbreviations: ROC, receiver operating characteristic; AUC, area under the curve.

Table 3 Sensitivity, Specificity, and Proportion Correctly Classified at Different Cut-off Scores of the SRQ-20

Cut-off Score	Sensitivity (%)	Specificity (%)	Correctly Classified (%)
0/1	100.00	17.62	24.29
1/2	94.12	37.82	42.38
2/3	94.12	51.30	54.76
3/4	82.24	62.18	64.29
4/5	88.24	74.09	75.24
5/6	82.35	84.46	84.29
6/7	76.47	90.16	89.05
7/8	70.59	92.75	90.95
8/9	70.59	95.85	93.81
9/10	52.94	96.89	93.33
10/11	47.06	97.93	93.81
11/12	41.18	98.45	93.81
12/13	29.41	99.48	93.81