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RAADS–R Test – Ritvo Autism Asperger Diagnostic Scale

Research Dataset

Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R)

Normative and Psychometric Statistics
STRONG N=305 α=0.925 32Countries
Abstract

Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R) normative dataset currently contains 305 participant records collected between Jun 6, 2026 and Aug 19, 2026 .

This psychometric dataset currently includes 305 anonymous participant responses collected through voluntary participation. The observed mean score was 43.83 with a standard deviation of 17.82, indicating moderate score variability within the sampled population. Internal consistency reliability analysis demonstrated excellent reliability (Cronbach alpha = 0.925). Observed skewness (0.46) and kurtosis (-0.03) were examined as indicators of distribution quality. The score distribution appeared reasonably balanced and did not suggest substantial departures from normality.

305
Participants
32
Countries
80
Scale Items
0.925
Reliability
Table 1
Dataset Overview
Assessment Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R)
Research Status Established Dataset
Dataset Maturity 80 /100 — STRONG
Participants 305
Countries Represented 32
Items 80
Dimensions 4
Data Collection Period Jun 6, 2026 – Aug 19, 2026
Reliability α = 0.925
Note. The current Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R) dataset contains 305 participant records collected from 32 countries. Dataset maturity reflects sample size, geographic diversity, and internal consistency reliability.
Table 2
Descriptive Statistics
Statistic Value
Mean Score 43.83%
Median Score 41
Standard Deviation 17.82
Variance 317.44
Standard Error 1.02
95% CI Lower 41.83
95% CI Upper 45.83
Minimum Score 3%
Maximum Score 98%
Observed Range 95
Note. M = 43.83, SD = 17.82, Median = 41. The 95% confidence interval ranged from 41.83 to 45.83.
Table 3
Sample Characteristics
Variable Summary
Participants N = 305
Countries 32
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 32 countries. The largest contribution originated from DE (30.8% of available geographic records).
Table 4
Percentile Norms
Percentile Score Interpretation
10th 23% Very Low
25th 32% Below Average
50th 41% Average
75th 54% Above Average
90th 68% Elevated
Note. Percentile values provide preliminary normative benchmarks derived from the current Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R) sample.
Figure 2
Score Distribution
Note. Observed scores ranged from 3% to 98% (M = 43.83, SD = 17.82). Distribution characteristics included skewness (0.46) and kurtosis (-0.03). Distribution indices suggested no substantial departures from normality.
Table 5
Reliability Analysis
Metric Value
Cronbach Alpha 0.925
Reliability Classification Excellent
Participants 305
Items 80
Standard Error 1.02
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 Q44 0.6 Excellent Q55 0.58 Excellent Q60 0.56 Excellent Q76 0.55 Excellent Q67 0.54 Excellent Q32 0.53 Excellent Q5 0.53 Excellent Q17 0.52 Excellent Q24 0.51 Excellent Q54 0.51 Excellent Q64 0.51 Excellent Q75 0.51 Excellent Q13 0.51 Excellent Q56 0.5 Excellent Q27 0.49 Acceptable Q29 0.49 Acceptable Q65 0.49 Acceptable Q73 0.49 Acceptable Q21 0.49 Acceptable Q28 0.49 Acceptable Q39 0.48 Acceptable Q45 0.47 Acceptable Q36 0.47 Acceptable Q57 0.45 Acceptable Q66 0.45 Acceptable Q19 0.45 Acceptable Q59 0.44 Acceptable Q16 0.44 Acceptable Q74 0.44 Acceptable Q51 0.44 Acceptable Q71 0.44 Acceptable Q25 0.44 Acceptable Q4 0.43 Acceptable Q52 0.43 Acceptable Q9 0.42 Acceptable Q30 0.42 Acceptable Q46 0.41 Acceptable Q15 0.4 Acceptable Q3 0.4 Acceptable Q63 0.4 Acceptable Q7 0.39 Acceptable Q50 0.38 Acceptable Q78 0.38 Acceptable Q12 0.38 Acceptable Q42 0.37 Acceptable Q35 0.37 Acceptable Q8 0.36 Acceptable Q1 0.36 Acceptable Q34 0.35 Acceptable Q20 0.35 Acceptable Q22 0.34 Acceptable Q69 0.34 Acceptable Q31 0.34 Acceptable Q48 0.34 Acceptable Q61 0.34 Acceptable Q14 0.33 Acceptable Q79 0.32 Acceptable Q41 0.32 Acceptable Q2 0.31 Acceptable Q10 0.31 Acceptable Q49 0.3 Acceptable Q37 0.27 Weak Q40 0.26 Weak Q18 0.25 Weak Q53 0.25 Weak Q80 0.23 Weak Q6 0.22 Weak Q77 0.22 Weak Q70 0.2 Problematic Q38 0.16 Problematic Q62 0.15 Problematic Q43 0.13 Problematic Q72 0.12 Problematic Q11 0.1 Problematic Q68 0.06 Problematic Q33 0.03 Problematic Q58 -0.02 Problematic Q23 -0.09 Problematic Q47 -0.2 Problematic Q26 -0.25 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 identified19 itemsthat may benefit from future review.

Items Recommended for Future Review
  • Q6 (r = 0.22)
    I can put myself in other people's shoes.
  • Q11 (r = 0.1)
    I miss my best friends or family when we are apart for a long time.
  • Q18 (r = 0.25)
    I understand when friends need to be comforted.
  • Q23 (r = -0.09)
    Meeting new people is usually easy for me.
  • Q26 (r = -0.25)
    I like having conversations with several people at the same time.
  • Q33 (r = 0.03)
    I speak with a normal rhythm.
  • Q37 (r = 0.27)
    I am an understanding type of person.
  • Q38 (r = 0.16)
    I do not connect with characters in movies and cannot feel what they feel.
  • Q40 (r = 0.26)
    I can see in my mind exact details of things that interest me.
  • Q43 (r = 0.13)
    I like to talk things over with my friends.
  • Q47 (r = -0.2)
    I feel very comfortable with dating or being in social situations with others.
  • Q53 (r = 0.25)
    I am considered a compassionate type of person.
  • Q58 (r = -0.02)
    I can chat and make small talk with people.
  • Q62 (r = 0.15)
    I usually speak in a normal tone.
  • Q68 (r = 0.06)
    I can tell when someone says one thing but means something else.
  • Q70 (r = 0.2)
    I organize my thoughts in unusual or highly structured ways in my memory.
  • Q72 (r = 0.12)
    I enjoy spending time eating and talking with my family and friends.
  • Q77 (r = 0.22)
    I like to have close friends.
  • Q80 (r = 0.23)
    I tend to point out other people's mistakes.
The lowest item–total correlation was observed for Q26 ("I like having conversations with several people at the same time."; r = -0.25), indicating comparatively weaker alignment with the overall construct.
Table 7
Dimension Norms
Dimension Mean SD N
Social Relatedness 47.5% 18.6 305
Language 43.46% 21.42 305
Sensory-Motor 39.86% 24.52 305
Circumscribed Interests 36.48% 22.91 305
Note. Dimension statistics summarize normative performance across the major constructs measured by Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R).
Figure 5
Dimension Profile
Note. The highest observed dimension was Social Relatedness (47.5%), whereas the lowest observed dimension was Circumscribed Interests (36.5%). The observed difference between dimensions was 11 percentage points. Moderate variation was observed between dimensions.
Table 8
Dataset Growth Summary
Metric Value
Current Participants 305
Countries 32
Collection Start Jun 6, 2026
Collection End Aug 19, 2026
Months Recorded 3
Note. Growth statistics summarize cumulative participation throughout the observed data collection period.
Normative Data Notice

A total of 305 participant responses were available for this assessment. Dimension-level norms were calculated using 305 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

Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R). Research Dataset. Retrieved from https://drdeenz.com/raads-r/statistics/

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