Drdeenz_ The Psychometric Tool

Dysthymia Test – Persistent Depressive Spectrum Test

Research Dataset

Deenz Persistent Depressive Scale (DPDS)

Normative and Psychometric Statistics
ROBUST N=1000 α=0.898 64Countries
Abstract

Deenz Persistent Depressive Scale (DPDS) normative dataset currently contains 1000 participant records collected between Jun 11, 2026 and Sep 20, 2026 .

This psychometric dataset currently includes 1000 anonymous participant responses collected through voluntary participation. The observed mean score was 67.02 with a standard deviation of 13.56, indicating moderate score variability within the sampled population. Internal consistency reliability analysis demonstrated good reliability (Cronbach alpha = 0.898). Observed skewness (-0.58) and kurtosis (1.47) were examined as indicators of distribution quality. The score distribution appeared reasonably balanced and did not suggest substantial departures from normality.

1000
Participants
64
Countries
30
Scale Items
0.898
Reliability
Table 1
Dataset Overview
Assessment Deenz Persistent Depressive Scale (DPDS)
Research Status Robust Dataset
Dataset Maturity 95 /100 — ROBUST
Participants 1000
Countries Represented 64
Items 30
Dimensions 6
Data Collection Period Jun 11, 2026 – Sep 20, 2026
Reliability α = 0.898
Note. The current Deenz Persistent Depressive Scale (DPDS) dataset contains 1000 participant records collected from 64 countries. Dataset maturity reflects sample size, geographic diversity, and internal consistency reliability.
Table 2
Descriptive Statistics
Statistic Value
Mean Score 67.02%
Median Score 68
Standard Deviation 13.56
Variance 183.79
Standard Error 0.43
95% CI Lower 66.18
95% CI Upper 67.86
Minimum Score 0%
Maximum Score 97%
Observed Range 97
Note. M = 67.02, SD = 13.56, Median = 68. The 95% confidence interval ranged from 66.18 to 67.86.
Table 3
Sample Characteristics
Variable Summary
Participants N = 1000
Countries 64
Age Information Available
Gender Information Available
Note. Demographic information was collected voluntarily. Participant counts may vary across demographic categories when information was not reported.
Figure 1
Global Participation
Note. Participants were represented across 64 countries. The largest contribution originated from BR (25.3% of available geographic records).
Table 4
Percentile Norms
Percentile Score Interpretation
10th 50% Very Low
25th 59% Below Average
50th 68% 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 0% to 97% (M = 67.02, SD = 13.56). Distribution characteristics included skewness (-0.58) and kurtosis (1.47). Distribution indices suggested no substantial departures from normality.
Table 5
Reliability Analysis
Metric Value
Cronbach Alpha 0.898
Reliability Classification Good
Participants 1000
Items 30
Standard Error 0.43
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 Item Quality r Rating Q27 0.62 Excellent Q17 0.61 Excellent Q7 0.57 Excellent Q25 0.56 Excellent Q10 0.55 Excellent Q19 0.54 Excellent Q8 0.54 Excellent Q4 0.54 Excellent Q22 0.53 Excellent Q24 0.52 Excellent Q14 0.52 Excellent Q26 0.51 Excellent Q20 0.49 Acceptable Q12 0.48 Acceptable Q15 0.46 Acceptable Q3 0.46 Acceptable Q6 0.44 Acceptable Q16 0.44 Acceptable Q1 0.43 Acceptable Q29 0.43 Acceptable Q18 0.42 Acceptable Q9 0.42 Acceptable Q21 0.41 Acceptable Q5 0.4 Acceptable Q11 0.4 Acceptable Q2 0.37 Acceptable Q28 0.33 Acceptable Q23 0.31 Acceptable Q13 0.26 Weak Q30 0.03 Problematic
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 identified2 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.
  • Q30 (r = 0.03)
    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 = 0.03), indicating comparatively weaker alignment with the overall construct.
Table 7
Dimension Norms
Dimension Mean SD N
Social Withdrawal 70.04% 18.14 1000
Motivation Deficit 69.21% 17.18 1000
Persistent Sadness 68.95% 17.47 1000
Low Self-Worth 68.58% 20.07 1000
Emotional Distress 68.49% 17.73 1000
Hopelessness 48.59% 15.54 1000
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 (70%), whereas the lowest observed dimension was Hopelessness (48.6%). The observed difference between dimensions was 21.5 percentage points. Substantial variation was observed between dimensions.
Table 8
Dataset Growth Summary
Metric Value
Current Participants 1000
Countries 64
Collection Start Jun 11, 2026
Collection End Sep 20, 2026
Months Recorded 4
Note. Growth statistics summarize cumulative participation throughout the observed data collection period.
Normative Data Notice

A total of 1000 participant responses were available for this assessment. Dimension-level norms were calculated using 1000 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/

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