Deenz Persistent Depressive Scale (DPDS)
normative dataset currently contains
254
participant records collected between
Jun 11, 2026
and
Jun 27, 2026
.
This psychometric dataset currently includes 254 anonymous participant responses collected through voluntary participation. The observed mean score was 66.16 with a standard deviation of 13.78, indicating moderate score variability within the sampled population. Internal consistency reliability analysis demonstrated excellent reliability (Cronbach alpha = 0.904). Observed skewness (-0.16) and kurtosis (-0.32) were examined as indicators of distribution quality. The score distribution appeared reasonably balanced and did not suggest substantial departures from normality.
254
Participants
26
Countries
30
Items
0.904
Reliability
Table 1
Dataset Overview
Assessment
Deenz Persistent Depressive Scale (DPDS)
Research Status
Established Dataset
Dataset Maturity
80
/100 —
STRONG
Participants
254
Countries Represented
26
Items
30
Dimensions
6
Data Collection Period
Jun 11, 2026
–
Jun 27, 2026
Reliability
α =
0.904
Note.
The current Deenz Persistent Depressive Scale (DPDS) dataset contains 254 participant records collected from 26 countries. Dataset maturity reflects sample size, geographic diversity, and internal consistency reliability.
Table 2
Descriptive Statistics
Statistic
Value
Mean Score
66.16%
Median Score
67
Standard Deviation
13.78
Variance
189.87
Standard Error
0.86
95% CI Lower
64.47
95% CI Upper
67.86
Minimum Score
32%
Maximum Score
95%
Observed Range
63
Note.
M = 66.16, SD = 13.78, Median = 67. The 95% confidence interval ranged from 64.47 to 67.86.
Table 3
Sample Characteristics
Variable
Summary
Participants
N =
254
Countries
26
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
25
under18
19
25-34
16
35-44
7
prefer_not
6
55plus
5
45-54
3
Gender Distribution
Gender
Participants
Male
42
Female
36
Prefer_not
3
Figure 1
Global Participation
Note.
Participants were represented across 26 countries. The largest contribution originated from US (24% of available geographic records).
Country
Participants
Percent
US
61
24%
BR
43
16.9%
UA
35
13.8%
DE
29
11.4%
MD
9
3.5%
PL
8
3.1%
BY
8
3.1%
NL
7
2.8%
FR
7
2.8%
PY
6
2.4%
RU
5
2%
CN
4
1.6%
SE
4
1.6%
RO
3
1.2%
CA
3
1.2%
FI
3
1.2%
PH
2
0.8%
IL
2
0.8%
IT
2
0.8%
DK
2
0.8%
PE
2
0.8%
VE
2
0.8%
EG
2
0.8%
BE
2
0.8%
GE
2
0.8%
AU
1
0.4%
Table 4
Percentile Norms
Percentile
Score
Interpretation
10th
48%
Very Low
25th
57%
Below Average
50th
67%
Average
75th
76%
Above Average
90th
87%
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 32% to 95% (M = 66.16, SD = 13.78). Distribution characteristics included skewness (-0.16) and kurtosis (-0.32).
Distribution indices suggested no substantial departures from normality.
Table 5
Reliability Analysis
Metric
Value
Cronbach Alpha
0.904
Reliability Classification
Excellent
Participants
254
Items
30
Standard Error
0.86
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 identified4
itemsthat may benefit from future review.
Items Recommended for Future Review
Q13
(r = 0.18)
I have difficulty falling asleep or staying asleep at night.
Q23
(r = 0.19)
I struggle to find joy in the success of others.
Q28
(r = 0.28)
I lost interest in romantic or sexual relationships.
Q30
(r = 0.08)
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 = 0.08), indicating comparatively weaker alignment with the overall construct.
Table 7
Dimension Norms
Dimension
Mean
SD
N
Persistent Sadness
74.94%
15.38
78
Motivation Deficit
71.5%
19.18
78
Low Self-Worth
70.46%
18.21
78
Social Withdrawal
70.06%
15.74
78
Emotional Distress
67.23%
18.12
78
Hopelessness
45.86%
15.3
78
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 Persistent Sadness (74.9%), whereas the lowest observed dimension was Hopelessness (45.9%). The observed difference between dimensions was 29.1 percentage points. Substantial variation was observed between dimensions.
Table 8
Dataset Growth Summary
Metric
Value
Current Participants
254
Countries
26
Collection Start
Jun 11, 2026
Collection End
Jun 27, 2026
Months Recorded
1
Note.
Growth statistics summarize cumulative participation throughout the observed data collection period.
Normative Data Notice
A total of
254
participant responses were available for this assessment.
Dimension-level norms were calculated using
78
valid response records.
Approximately
176
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/