Skip to main content

Major Depression Inventory (MDI) Research Statistics

Assessment Information
  • Sample Adequacy: Preliminary dataset. Interpret norms cautiously.
  • Research Status: PRELIMINARY NORMATIVE DATASET
  • Items: 12
  • Dimensions: 12
  • Dataset Maturity: The current dataset achieved a maturity score of 25/100 and is classified as PRELIMINARY.

Table 1
Normative Dataset Overview
Descriptive characteristics of the current normative sample.
Participants 4
Countries Represented 3
Dataset Maturity 25/100 — PreliminaryDataset
Research Status PRELIMINARY NORMATIVE DATASET
Sample Adequacy Preliminary dataset. Interpret norms cautiously.
Data Collection Period May 24, 2026 – Aug 9, 2026
The current normative dataset consists of 4 participants collected from 3 countries.
Table 2
Score Statistics
Measures of central tendency and variability.
Mean Score 55.25%
Median Score 61.5
Standard Deviation 21.55
Variance 464.25
Standard Error (SEM) 10.77
Reliability (α) 0.703
Items 12
Dimensions 12
The sample demonstrated a mean score of 55.25% (Mdn = 61.5, SD = 21.55).
Table 3
Distribution Characteristics
Distribution shape and score dispersion indicators.
Observed Score Range 48
Maximum Observed Score 73%
Minimum Observed Score 25%
95% Confidence Interval 34.13– 76.37
Skewness -1.33
Kurtosis 1.39
Observed skewness (-1.33) and kurtosis (1.39) provide indicators of distribution quality and normality.
Global Participation Chart Participants IN 2 #1 US 1 #2 DE 1 #3
Global Participation Interpretation

The current dataset includes responses from 3countries . The largest contribution currently comes from IN which represents approximately 50% of all participants. International participation enhances sample diversity and improves the generalizability of normative findings across geographic regions.

Normative Percentile Distribution

Population Median 10th Percentile 25 Population Median 25th Percentile 25 Population Median 50th Percentile 55 Population Median 75th Percentile 68 Population Median 90th Percentile 68
Normative Interpretation

The current normative dataset indicates that approximately 10% of participants scored below 25%, while 90% scored above this level. The median score was 55%, meaning that half of participants scored below this value and half scored above it. Scores of 68% or greater were achieved by approximately the highest 25% of participants, whereas scores of 68% or greater were achieved by approximately the highest 10% of participants. These percentile values provide preliminary normative benchmarks that can be used to contextualize individual assessment results relative to the current community sample.

Distribution Histogram

20-29 1 50-59 1 60-69 1 70-79 1
Distribution Interpretation

This histogram displays the distribution of participant scores across the assessment. A balanced bell-shaped pattern generally indicates good score dispersion and stronger normative utility, whereas highly skewed distributions may indicate floor effects, ceiling effects, or sample bias.

Distribution Quality

The score distribution demonstrated a skewness of -1.33 and a kurtosis of 1.39.

The distribution demonstrates mild departures from normality, although the overall score pattern remains broadly interpretable for preliminary normative purposes.

Reliability Analysis

0.703 Poor Acceptable Good Excellent

ACCEPTABLE RELIABILITY

The assessment demonstrated acceptable internal consistency reliability (Cronbach's α = 0.703), suggesting that the assessment items measure a relatively coherent psychological construct.

Item–Total Correlations

Insufficient Sample Size

Item–total correlations are not currently reported because the assessment has fewer than 100 participant responses. Psychometric item analysis requires a larger sample to produce stable and interpretable estimates.

Current Participants: 4
Minimum Recommended: 100

Dimension Norms

Dimension Profile Mean SD 50% Concentration Difficulties 70% 11.6 Guilt and Self-Blame 65% 30 Hopelessness and Suicidal Thoughts 65% 44.4 Restlessness 65% 34.2 Loss of Interest 60% 36.5 Self-Confidence 60% 23.1 Sleep Difficulties 60% 28.3 Depressed Mood 55% 30 Fatigue and Low Energy 45% 34.2 Reduced Appetite 45% 34.2 Increased Appetite 40% 36.5 Psychomotor Slowing 35% 41.2
Dimension Interpretation

The highest scoring dimension in the current sample was Concentration Difficulties (70%). The lowest scoring dimension was Psychomotor Slowing (35%). Dimensions located above the 50% reference line represent characteristics that were more strongly endorsed within the current participant sample. Standard deviations indicate the degree of variability observed across participant responses.

Research Interpretation

This psychometric dataset currently includes 4 anonymous participant responses collected through voluntary participation. The observed mean score was 55.25 with a standard deviation of 21.55, indicating moderate score variability within the sampled population. Internal consistency reliability analysis demonstrated acceptable reliability (Cronbach alpha = 0.703). Observed skewness (-1.33) and kurtosis (1.39) were examined as indicators of distribution quality. The distribution demonstrated mild departures from normality, although the overall score pattern remained broadly interpretable for preliminary normative purposes.

Ethical & Research Notice

All responses included in this dataset are collected anonymously through voluntary participation. No personally identifying information is stored. Results are intended exclusively for educational, psychometric, research, and self-reflective purposes and should not be used as clinical diagnoses. Trait Profiler continuously monitors response quality, distribution stability, and internal consistency to support ethical psychometric reporting.

Dataset Export

Download CSV Dataset

Research Citation

Major Depression Inventory (MDI). Trait Profiler Interactive Research Dataset. Retrieved from https://traitprofiler.com/major-depression-inventory/statistics/

License: Creative Commons Attribution 4.0 International (CC BY 4.0)