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Hare Psychopathy Checklist (Original) (PCL-22) Research Statistics

Assessment Information
  • Sample Adequacy: Robust dataset suitable for advanced normative interpretation.
  • Research Status: ROBUST DATASET
  • Items: 22
  • Dimensions: 10
  • Dataset Maturity: The current dataset achieved a maturity score of 90/100 and is classified as ROBUST.

Table 1
Normative Dataset Overview
Descriptive characteristics of the current normative sample.
Participants 513
Countries Represented 28
Dataset Maturity 90/100 — RobustDataset
Research Status ROBUST NORMATIVE DATASET
Sample Adequacy Robust dataset suitable for advanced normative interpretation.
Data Collection Period May 25, 2026 – Oct 28, 2026
The current normative dataset consists of 513 participants collected from 28 countries.
Table 2
Score Statistics
Measures of central tendency and variability.
Mean Score 38.69%
Median Score 34
Standard Deviation 25.77
Variance 664
Standard Error (SEM) 1.14
Reliability (α) 0.938
Items 22
Dimensions 10
The sample demonstrated a mean score of 38.69% (Mdn = 34, SD = 25.77).
Table 3
Distribution Characteristics
Distribution shape and score dispersion indicators.
Observed Score Range 100
Maximum Observed Score 100%
Minimum Observed Score 0%
95% Confidence Interval 36.46– 40.92
Skewness 0.51
Kurtosis -0.59
Observed skewness (0.51) and kurtosis (-0.59) provide indicators of distribution quality and normality.
Global Participation Chart Participants DE 263 #1 IN 119 #2 AT 43 #3 US 20 #4 CH 20 #5 AU 5 #6 FR 5 #7 GB 5 #8 SE 4 #9 AE 3 #10 IT 3 #11 DK 2 #12 JP 2 #13 TH 2 #14 NL 2 #15 GE 2 #16 CA 2 #17 CN 1 #18 HU 1 #19 RE 1 #20 SG 1 #21 QA 1 #22 FI 1 #23 LU 1 #24 TW 1 #25 CZ 1 #26 PT 1 #27 ZA 1 #28
Global Participation Interpretation

The current dataset includes responses from 28countries . The largest contribution currently comes from DE which represents approximately 51.3% 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 7 Population Median 25th Percentile 16 Population Median 50th Percentile 34 Population Median 75th Percentile 59 Population Median 90th Percentile 75
Normative Interpretation

The current normative dataset indicates that approximately 10% of participants scored below 7%, while 90% scored above this level. The median score was 34%, meaning that half of participants scored below this value and half scored above it. Scores of 59% or greater were achieved by approximately the highest 25% of participants, whereas scores of 75% 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

0-9 78 10-19 73 100-109 2 20-29 46 30-39 105 40-49 38 50-59 68 60-69 35 70-79 27 80-89 21 90-99 20
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 0.51 and a kurtosis of -0.59.

The score distribution appears reasonably balanced and does not currently suggest substantial departures from normality.

Reliability Analysis

0.938 Poor Acceptable Good Excellent

EXCELLENT RELIABILITY

The assessment demonstrated excellent internal consistency reliability (Cronbach's α = 0.938), suggesting that the assessment items measure a relatively coherent psychological construct.

Item–Total Correlations

Item Item Quality r Rating Q20 0.75 Excellent Q9 0.73 Excellent Q7 0.73 Excellent Q10 0.7 Excellent Q21 0.69 Excellent Q3 0.69 Excellent Q5 0.68 Excellent Q16 0.68 Excellent Q8 0.68 Excellent Q13 0.65 Excellent Q6 0.64 Excellent Q11 0.62 Excellent Q12 0.6 Excellent Q22 0.6 Excellent Q18 0.57 Excellent Q15 0.56 Excellent Q2 0.55 Excellent Q19 0.53 Excellent Q17 0.52 Excellent Q14 0.51 Excellent Q4 0.51 Excellent Q1 0.44 Acceptable
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. All items demonstrated acceptable or stronger discrimination. No item-level psychometric concerns were identified within the current dataset.

Dimension Norms

Dimension Profile Mean SD 50% Behavioral Instability 69.9% 24.8 Callousness and Lack of Empathy 55.5% 23.5 Impulsivity 48.3% 24.3 Interpersonal Manipulation 47.8% 28 Irresponsibility 41.2% 28.2 Grandiosity and Narcissism 38.7% 24.9 Emotional Detachment 37.2% 45.1 Antisocial Behavior 36.3% 31.2 Social Deviance 34.8% 23.4 Criminal Versatility 27.1% 37.2
Dimension Interpretation

The highest scoring dimension in the current sample was Behavioral Instability (69.9%). The lowest scoring dimension was Criminal Versatility (27.1%). 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.

Normative Dataset Growth 107 May 2026 127 Jun 2026 138 Jul 2026 190 Aug 2026 252 Sep 2026 513 Oct 2026
Dataset Growth Interpretation

The current normative dataset contains 513 participants . The cumulative growth curve illustrates how the participant sample has expanded over time. Increasing sample sizes generally improve the stability of percentile norms, reliability estimates, and other psychometric statistics.

Normative Data Notice

A total of 513 participant responses were available for this assessment. Dimension-level norms were calculated using 133 valid response records. Approximately 380 response record(s) were excluded from dimension-level normative calculations due to incomplete response patterns, historical data inconsistencies, or automated data-quality screening procedures.

Research Interpretation

This psychometric dataset currently includes 513 anonymous participant responses collected through voluntary participation. The observed mean score was 38.69 with a standard deviation of 25.77, indicating moderate score variability within the sampled population. Internal consistency reliability analysis demonstrated excellent reliability (Cronbach alpha = 0.938). Observed skewness (0.51) and kurtosis (-0.59) were examined as indicators of distribution quality. The score distribution appeared reasonably balanced and did not suggest substantial departures from normality.

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

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Research Citation

Hare Psychopathy Checklist (Original) (PCL-22). Trait Profiler Interactive Research Dataset. Retrieved from https://traitprofiler.com/hare-psychopathy-checklist/statistics/

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