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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=178 α=0.911 22Countries
Abstract

Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R) normative dataset currently contains 178 participant records collected between Jun 6, 2026 and Jul 9, 2026 .

This psychometric dataset currently includes 178 anonymous participant responses collected through voluntary participation. The observed mean score was 44.56 with a standard deviation of 15.34, indicating moderate score variability within the sampled population. Internal consistency reliability analysis demonstrated excellent reliability (Cronbach alpha = 0.911). Observed skewness (0.35) and kurtosis (-0.31) were examined as indicators of distribution quality. The score distribution appeared reasonably balanced and did not suggest substantial departures from normality.

178
Participants
22
Countries
80
Scale Items
0.911
Reliability
Table 1
Dataset Overview
Assessment Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R)
Research Status Established Dataset
Dataset Maturity 70 /100 — STRONG
Participants 178
Countries Represented 22
Items 80
Dimensions 4
Data Collection Period Jun 6, 2026 – Jul 9, 2026
Reliability α = 0.911
Note. The current Ritvo Autism Asperger Diagnostic Scale – Revised (RAADS-R) dataset contains 178 participant records collected from 22 countries. Dataset maturity reflects sample size, geographic diversity, and internal consistency reliability.
Table 2
Descriptive Statistics
Statistic Value
Mean Score 44.56%
Median Score 43.5
Standard Deviation 15.34
Variance 235.38
Standard Error 1.15
95% CI Lower 42.31
95% CI Upper 46.82
Minimum Score 10%
Maximum Score 86%
Observed Range 76
Note. M = 44.56, SD = 15.34, Median = 43.5. The 95% confidence interval ranged from 42.31 to 46.82.
Table 3
Sample Characteristics
Variable Summary
Participants N = 178
Countries 22
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 22 countries. The largest contribution originated from DE (25.8% of available geographic records).
Table 4
Percentile Norms
Percentile Score Interpretation
10th 23% Very Low
25th 33% Below Average
50th 43% Average
75th 53% Above Average
90th 65% 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 10% to 86% (M = 44.56, SD = 15.34). Distribution characteristics included skewness (0.35) and kurtosis (-0.31). Distribution indices suggested no substantial departures from normality.
Table 5
Reliability Analysis
Metric Value
Cronbach Alpha 0.911
Reliability Classification Excellent
Participants 178
Items 80
Standard Error 1.15
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 0.61 Excellent Q27 0.55 Excellent Q54 0.54 Excellent Q66 0.5 Acceptable Q5 0.49 Acceptable Q75 0.49 Acceptable Q64 0.48 Acceptable Q13 0.48 Acceptable Q24 0.48 Acceptable Q56 0.48 Acceptable Q76 0.47 Acceptable Q74 0.47 Acceptable Q45 0.47 Acceptable Q25 0.46 Acceptable Q65 0.46 Acceptable Q60 0.46 Acceptable Q17 0.46 Acceptable Q59 0.45 Acceptable Q29 0.44 Acceptable Q32 0.44 Acceptable Q39 0.43 Acceptable Q7 0.43 Acceptable Q55 0.43 Acceptable Q19 0.41 Acceptable Q1 0.41 Acceptable Q67 0.4 Acceptable Q16 0.4 Acceptable Q52 0.4 Acceptable Q12 0.4 Acceptable Q28 0.4 Acceptable Q57 0.39 Acceptable Q15 0.38 Acceptable Q37 0.38 Acceptable Q71 0.37 Acceptable Q48 0.37 Acceptable Q6 0.37 Acceptable Q51 0.37 Acceptable Q4 0.36 Acceptable Q21 0.36 Acceptable Q36 0.36 Acceptable Q73 0.34 Acceptable Q9 0.33 Acceptable Q46 0.33 Acceptable Q53 0.32 Acceptable Q2 0.32 Acceptable Q18 0.31 Acceptable Q31 0.31 Acceptable Q77 0.31 Acceptable Q35 0.3 Weak Q8 0.29 Weak Q63 0.29 Weak Q3 0.29 Weak Q40 0.26 Weak Q79 0.26 Weak Q43 0.25 Weak Q68 0.25 Weak Q80 0.25 Weak Q61 0.24 Weak Q20 0.24 Weak Q72 0.24 Weak Q14 0.24 Weak Q30 0.24 Weak Q50 0.23 Weak Q78 0.22 Weak Q10 0.22 Weak Q62 0.21 Weak Q69 0.21 Weak Q41 0.21 Weak Q22 0.2 Problematic Q49 0.19 Problematic Q42 0.16 Problematic Q11 0.14 Problematic Q34 0.14 Problematic Q58 0.12 Problematic Q33 0.1 Problematic Q38 0.05 Problematic Q70 0.02 Problematic Q23 -0.04 Problematic Q47 -0.13 Problematic Q26 -0.22 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 identified32 itemsthat may benefit from future review.

Items Recommended for Future Review
  • Q3 (r = 0.29)
    I am often surprised when others tell me I have been rude.
  • Q8 (r = 0.29)
    I only like to talk to people who share my special interests.
  • Q10 (r = 0.22)
    I always notice how food feels in my mouth more than how it tastes.
  • Q11 (r = 0.14)
    I miss my best friends or family when we are apart for a long time.
  • Q14 (r = 0.24)
    I would rather go out to eat alone in a restaurant than with someone I know.
  • Q20 (r = 0.24)
    I like to copy the way certain people speak and act because it helps me appear more normal.
  • Q22 (r = 0.2)
    I have to act normal to please other people and make them like me.
  • Q23 (r = -0.04)
    Meeting new people is usually easy for me.
  • Q26 (r = -0.22)
    I like having conversations with several people at the same time.
  • Q30 (r = 0.24)
    I get extremely upset when the way I like to do things is suddenly changed.
  • Q33 (r = 0.1)
    I speak with a normal rhythm.
  • Q34 (r = 0.14)
    The same sound, colour, or texture can suddenly change from very sensitive to very dull.
  • Q35 (r = 0.3)
    The phrase “I've got you under my skin” makes me uncomfortable.
  • Q38 (r = 0.05)
    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.
  • Q41 (r = 0.21)
    I keep lists of things that interest me even when they have no practical use.
  • Q42 (r = 0.16)
    When I feel overwhelmed by my senses, I have to isolate myself to shut them down.
  • Q43 (r = 0.25)
    I like to talk things over with my friends.
  • Q47 (r = -0.13)
    I feel very comfortable with dating or being in social situations with others.
  • Q49 (r = 0.19)
    I have been told that I have an unusual voice, such as flat, monotone, childish, or high-pitched.
  • Q50 (r = 0.23)
    Sometimes a thought or subject gets stuck in my mind and I have to talk about it even if no one is interested.
  • Q58 (r = 0.12)
    I can chat and make small talk with people.
  • Q61 (r = 0.24)
    People who know me best consider me a loner.
  • Q62 (r = 0.21)
    I usually speak in a normal tone.
  • Q63 (r = 0.29)
    I like things to stay exactly the same day after day.
  • Q68 (r = 0.25)
    I can tell when someone says one thing but means something else.
  • Q69 (r = 0.21)
    I like to be by myself as much as I can.
  • Q70 (r = 0.02)
    I organize my thoughts in unusual or highly structured ways in my memory.
  • Q72 (r = 0.24)
    I enjoy spending time eating and talking with my family and friends.
  • Q78 (r = 0.22)
    People often tell me that I give too much detail.
  • Q79 (r = 0.26)
    I am often told that I ask embarrassing questions.
  • Q80 (r = 0.25)
    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 = -0.22), indicating comparatively weaker alignment with the overall construct.
Table 7
Dimension Norms
Dimension Mean SD N
Social Relatedness 47.51% 16.89 178
Language 44.07% 19.48 178
Sensory-Motor 41.02% 21.8 178
Circumscribed Interests 38.93% 21.01 178
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 (38.9%). The observed difference between dimensions was 8.6 percentage points. Moderate variation was observed between dimensions.
Table 8
Dataset Growth Summary
Metric Value
Current Participants 178
Countries 22
Collection Start Jun 6, 2026
Collection End Jul 9, 2026
Months Recorded 2
Note. Growth statistics summarize cumulative participation throughout the observed data collection period.
Normative Data Notice

A total of 178 participant responses were available for this assessment. Dimension-level norms were calculated using 178 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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