Dysthymia Test – Persistent Depressive Spectrum Test
Research Dataset
Deenz Persistent Depressive Scale (DPDS)
Normative and Psychometric Statistics
STRONG
N=479
α=0.895
47Countries
Abstract
Deenz Persistent Depressive Scale (DPDS)
normative dataset currently contains
479
participant records collected between
Jun 11, 2026
and
Jul 20, 2026
.
This psychometric dataset currently includes 479 anonymous participant responses collected through voluntary participation. The observed mean score was 66.29 with a standard deviation of 13.37, indicating moderate score variability within the sampled population. Internal consistency reliability analysis demonstrated good reliability (Cronbach alpha = 0.895). Observed skewness (-0.1) and kurtosis (-0.31) were examined as indicators of distribution quality. The score distribution appeared reasonably balanced and did not suggest substantial departures from normality.
479
Participants
47
Countries
30
Scale Items
0.895
Reliability
Table 1
Dataset Overview
Assessment
Deenz Persistent Depressive Scale (DPDS)
Research Status
Established Dataset
Dataset Maturity
75
/100 —
STRONG
Participants
479
Countries Represented
47
Items
30
Dimensions
6
Data Collection Period
Jun 11, 2026
–
Jul 20, 2026
Reliability
α =
0.895
Note.
The current Deenz Persistent Depressive Scale (DPDS) dataset contains 479 participant records collected from 47 countries. Dataset maturity reflects sample size, geographic diversity, and internal consistency reliability.
Table 2
Descriptive Statistics
Statistic
Value
Mean Score
66.29%
Median Score
67
Standard Deviation
13.37
Variance
178.69
Standard Error
0.61
95% CI Lower
65.09
95% CI Upper
67.49
Minimum Score
30%
Maximum Score
97%
Observed Range
67
Note.
M = 66.29, SD = 13.37, Median = 67. The 95% confidence interval ranged from 65.09 to 67.49.
Table 3
Sample Characteristics
Variable
Summary
Participants
N =
479
Countries
47
Age Information
Available
Gender Information
Available
Note.
Demographic information was collected voluntarily. Participant counts may vary across demographic categories when information was not reported.
Age Distribution
Age Group
Participants
18-24
94
under18
67
25-34
61
35-44
31
prefer_not
21
55plus
10
45-54
9
Gender Distribution
Gender
Participants
Female
150
Male
128
Prefer_not
15
Figure 1
Global Participation
Note.
Participants were represented across 47 countries. The largest contribution originated from BR (22.1% of available geographic records).
Country
Participants
Percent
BR
106
22.1%
US
81
16.9%
UA
67
14%
DE
56
11.7%
NL
14
2.9%
PL
13
2.7%
BY
12
2.5%
MD
11
2.3%
FR
11
2.3%
PT
8
1.7%
SE
7
1.5%
CA
7
1.5%
RU
6
1.3%
PY
6
1.3%
GB
5
1%
CH
5
1%
RO
5
1%
FI
5
1%
CN
5
1%
ES
4
0.8%
IT
4
0.8%
PE
3
0.6%
MX
3
0.6%
TR
2
0.4%
VE
2
0.4%
EG
2
0.4%
BE
2
0.4%
GE
2
0.4%
PH
2
0.4%
IL
2
0.4%
DK
2
0.4%
IN
2
0.4%
AU
2
0.4%
KZ
2
0.4%
NO
1
0.2%
CL
1
0.2%
LT
1
0.2%
AR
1
0.2%
LV
1
0.2%
PA
1
0.2%
AT
1
0.2%
T1
1
0.2%
KG
1
0.2%
NZ
1
0.2%
EE
1
0.2%
GR
1
0.2%
MY
1
0.2%
Table 4
Percentile Norms
Percentile
Score
Interpretation
10th
48%
Very Low
25th
58%
Below Average
50th
67%
Average
75th
76%
Above Average
90th
84%
Elevated
Note.
Percentile values provide preliminary normative benchmarks derived from the current Deenz Persistent Depressive Scale (DPDS) sample.
Figure 2
Score Distribution
Note.
Observed scores ranged from 30% to 97% (M = 66.29, SD = 13.37). Distribution characteristics included skewness (-0.1) and kurtosis (-0.31).
Distribution indices suggested no substantial departures from normality.
Table 5
Reliability Analysis
Metric
Value
Cronbach Alpha
0.895
Reliability Classification
Good
Participants
479
Items
30
Standard Error
0.61
Note.
Internal consistency was estimated using Cronbach alpha. Reliability estimates are based on the current normative dataset and may change as additional responses are collected.
Item–Total Correlations
Item Analysis Interpretation
Item–total correlations were generally strong across the assessment, indicating that most items contribute effectively to the measurement of the underlying construct.
The analysis identified3
itemsthat may benefit from future review.
Items Recommended for Future Review
Q13
(r = 0.26)
I have difficulty falling asleep or staying asleep at night.
Q23
(r = 0.25)
I struggle to find joy in the success of others.
Q30
(r = 0.06)
I struggle to find reasons to look forward to the future.
The lowest item–total correlation was observed for Q30 ("I struggle to find reasons to look forward to the future."; r = 0.06), indicating comparatively weaker alignment with the overall construct.
Table 7
Dimension Norms
Dimension
Mean
SD
N
Social Withdrawal
69.31%
17.82
479
Persistent Sadness
68.95%
17.33
479
Motivation Deficit
68.81%
17.22
479
Emotional Distress
67.33%
18.44
479
Low Self-Worth
67.25%
19.46
479
Hopelessness
48.51%
16.39
479
Note.
Dimension statistics summarize normative performance across the major constructs measured by Deenz Persistent Depressive Scale (DPDS).
Figure 5
Dimension Profile
Note.
The highest observed dimension was Social Withdrawal (69.3%), whereas the lowest observed dimension was Hopelessness (48.5%). The observed difference between dimensions was 20.8 percentage points. Substantial variation was observed between dimensions.
Table 8
Dataset Growth Summary
Metric
Value
Current Participants
479
Countries
47
Collection Start
Jun 11, 2026
Collection End
Jul 20, 2026
Months Recorded
2
Note.
Growth statistics summarize cumulative participation throughout the observed data collection period.
Normative Data Notice
A total of
479
participant responses were available for this assessment.
Dimension-level norms were calculated using
479
valid response records.
Approximately
0
response record(s) were excluded from dimension-level normative calculations due to incomplete response patterns.
Limitations
Normative statistics are derived from voluntary participation and may not represent all populations. Reliability estimates, percentile norms, and dimension statistics should be interpreted in the context of the current sample and may change as additional responses are collected.
Ethical Statement
All records included in this dataset were collected anonymously. No personally identifying information is stored. Data are intended for educational, psychometric, and research purposes.
Recommended Citation
Deenz Persistent Depressive Scale (DPDS). Research Dataset. Retrieved from https://drdeenz.com/dysthymia-test/statistics/