The SRS-2 is a 65-item questionnaire assessing Social Awareness, Social Cognition, Social Communication, Social Motivation, and Restricted Interests and Repetitive Behavior. Items are scored on a 4-point scale (ranging from 1=not true to 4=almost always true). The raw score is the sum of responses and is converted to a T-score; the final T-score has a mean of 50 points with a standard deviation of 10 points, where lower scores indicate greater social responsiveness:

• Less than or equal to 59 = Low-to-no symptom impacts
• Between 60-65 = Mild-to-moderate defcits in social interaction
• Between 66-75 = Moderate defcit in social interaction
• Greater than or equal to 76 = Severe

The ABC Irritability subscale comprises 15 items rated on a 4-point scale (ranging from 0=no problem at all to 3 = problem is severe in degree). The total score is the sum of responses and ranges from 0 to 45; higher scores indicate greater presences of irritability related behavior.

The SCARED, Parent Version is a 41-item parent-report measure developed to measure child anxiety symptoms. Subscales include Somatic Symptoms/Panic Disorder, Generalized Anxiety Disorder, Separation Anxiety, Social Phobia, and School Phobia. Items are rated on a 3-point scale ranging from 0=not true or hardly ever true to 2=very true or often true. The total score is the sum of responses and ranges from 0 to 82; lower scores indicate lesser child anxiety symptoms.

The SDSC is a 26-item parent-completed assessment of their child's sleep-wake rhythm. The questionnaire measures Disorders of Initiating and Maintaining Sleep, Sleep Breathing Disorders, Disorders of Arousal, Sleep Wake Transition Disorders, Disorders of Excessive Somnolence, and Sleep Hyperhydrosis. Items are rated on 5-point scale where 1=never and 5=always (daily). The total score is the sum of responses and ranges from 26 to 130; lower scores indicate healthier sleep-wake rhythms.

Used to measure adaptive functioning across three core domains (Communication, Daily Living Skills, and Socialization), and two optional domains (Motor Skills and Maladaptive Behavior); items are rated on a 3-point scale (0=never; 1=sometimes; 2=usually or often). The core domains sum to a total Adaptive Behavior Composite. The range of possible composite scores ranges from 20-140, with a higher score indicating higher levels of adaptive functioning.

1-item assessment of clinicians impression of severity of illness. Illness severity is rated on a 7-point scale ranging from 1=not at all to 7=among the most extremely ill.

Parent/Caregiver form used to measure impact of autism interventions on family experience and quality of life. Items are rated on a 5-point scale where 1=always and 5=never. The total score is the sum of responses and ranges from 48 - 240; lower scores indicate better outcomes.

24-item Parent/Caregiver-completed form developed to detect symptoms of anxiety in youth with ASD. Items are rated on a 4-point scale (0=never and 3=always). The total score is the sum of responses and ranges from 0 to 72; lower scores indicate lesser symptoms of anxiety.

24-item Child-completed form developed to detect symptoms of anxiety in youth with ASD. Items are rated on a 4-point scale (0=never and 3=always). The total score is the sum of responses and ranges from 0 to 72; lower scores indicate lesser symptoms of anxiety.

Reflects clinicians impression of severity of illness on a 7-point scale ranging from 1=not present to 7="classic" autism.

Reflects clinicians impression of improvement on a 7-point scale ranging from 1=very much improved to 7=very much worse.

38-item Parent/Caregiver-completed measure designed to assess rigid patterns of behavior commonly associated with ASD. Items are rated on a 6-point Likert scale where 0=Not at all a problem and 5=Very severe or extreme problem. The total score is the sum of responses and ranges from 0 to 228; higher scores indicate greater behavioral inflexibility.

24-item Parent/Caregiver-completed questionnaire measuring behavioral noncompliance in everyday settings over the past four weeks. Severity of non-compliance is rated on a 9-point Likert scale (where 1 = no interruption, and 9 = frequent/consistent interruption). The total score is the sum of responses and ranges from 24 to 216; higher scores indicate greater behavioral noncompliance.

SWAN is an 18-item Parent/Caregiver-completed measure designed to assess symptoms of ADHD in children and adolescents. Items are rated on a 7-point Likert scale, where Far Below Average = 3, Below Average = 2, Somewhat Below Average = 1, Average = 0, Somewhat Above Average = -1, Above Average = -2, and Far Above Average = -3. The total score is the sum of responses and ranges from -54 to 54; the lower the score, the higher the severity of ADHD symptoms.

Participants who received 98% pure CBD: 9 mg/kg/day in Part 2 of the study.

Total of all reporting groups

Participants who received 98% pure CBD: 9 mg/kg/day in Part 2 of the study.

The RBS-R is a 43-item self report used to measure the breadth of repetitive behavior in children. For each item, behaviors are rated on a 4-point scale: 0-Behavior does not occur, 1-Behavior occurs and is a mild problem, 2-Behavior occurs and is a moderate problem, 3-Behavior occurs and is a severe problem. On the last question, participants are asked to "lump together" all of the behaviors described in the questionnaire, and provide a rating for how much of a problem these repetitive behaviors are overall, on a scale from 1-100: 1-Not a problem at all, to 100-As bad as you can imagine. A decrease in scores indicates the repetitive behaviors became less of a problem overall.

The total score is the sum of all items and ranges from 0 to 229.

The SRS-2 is a 65-item questionnaire assessing Social Awareness, Social Cognition, Social Communication, Social Motivation, and Restricted Interests and Repetitive Behavior. Items are scored on a 4-point scale (ranging from 1=not true to 4=almost always true). The raw score is the sum of responses and is converted to a T-score; the final T-score has a mean of 50 points with a standard deviation of 10 points, where lower scores indicate greater social responsiveness:

• Less than or equal to 59 = Low-to-no symptom impacts
• Between 60-65 = Mild-to-moderate defcits in social interaction
• Between 66-75 = Moderate defcit in social interaction
• Greater than or equal to 76 = Severe

The ABC Irritability subscale comprises 15 items rated on a 4-point scale (ranging from 0=no problem at all to 3 = problem is severe in degree). The total score is the sum of responses and ranges from 0 to 45; higher scores indicate greater presences of irritability related behavior.

The SCARED, Parent Version is a 41-item parent-report measure developed to measure child anxiety symptoms. Subscales include Somatic Symptoms/Panic Disorder, Generalized Anxiety Disorder, Separation Anxiety, Social Phobia, and School Phobia. Items are rated on a 3-point scale ranging from 0=not true or hardly ever true to 2=very true or often true. The total score is the sum of responses and ranges from 0 to 82; lower scores indicate lesser child anxiety symptoms.

The SDSC is a 26-item parent-completed assessment of their child's sleep-wake rhythm. The questionnaire measures Disorders of Initiating and Maintaining Sleep, Sleep Breathing Disorders, Disorders of Arousal, Sleep Wake Transition Disorders, Disorders of Excessive Somnolence, and Sleep Hyperhydrosis. Items are rated on 5-point scale where 1=never and 5=always (daily). The total score is the sum of responses and ranges from 26 to 130; lower scores indicate healthier sleep-wake rhythms.

Used to measure adaptive functioning across three core domains (Communication, Daily Living Skills, and Socialization), and two optional domains (Motor Skills and Maladaptive Behavior); items are rated on a 3-point scale (0=never; 1=sometimes; 2=usually or often). The core domains sum to a total Adaptive Behavior Composite. The range of possible composite scores ranges from 20-140, with a higher score indicating higher levels of adaptive functioning.

1-item assessment of clinicians impression of severity of illness. Illness severity is rated on a 7-point scale ranging from 1=not at all to 7=among the most extremely ill.

Parent/Caregiver form used to measure impact of autism interventions on family experience and quality of life. Items are rated on a 5-point scale where 1=always and 5=never. The total score is the sum of responses and ranges from 48 - 240; lower scores indicate better outcomes.

24-item Parent/Caregiver-completed form developed to detect symptoms of anxiety in youth with ASD. Items are rated on a 4-point scale (0=never and 3=always). The total score is the sum of responses and ranges from 0 to 72; lower scores indicate lesser symptoms of anxiety.

24-item Child-completed form developed to detect symptoms of anxiety in youth with ASD. Items are rated on a 4-point scale (0=never and 3=always). The total score is the sum of responses and ranges from 0 to 72; lower scores indicate lesser symptoms of anxiety.

Reflects clinicians impression of severity of illness on a 7-point scale ranging from 1=not present to 7="classic" autism.

Reflects clinicians impression of improvement on a 7-point scale ranging from 1=very much improved to 7=very much worse.

38-item Parent/Caregiver-completed measure designed to assess rigid patterns of behavior commonly associated with ASD. Items are rated on a 6-point Likert scale where 0=Not at all a problem and 5=Very severe or extreme problem. The total score is the sum of responses and ranges from 0 to 228; higher scores indicate greater behavioral inflexibility.

24-item Parent/Caregiver-completed questionnaire measuring behavioral noncompliance in everyday settings over the past four weeks. Severity of non-compliance is rated on a 9-point Likert scale (where 1 = no interruption, and 9 = frequent/consistent interruption). The total score is the sum of responses and ranges from 24 to 216; higher scores indicate greater behavioral noncompliance.

SWAN is an 18-item Parent/Caregiver-completed measure designed to assess symptoms of ADHD in children and adolescents. Items are rated on a 7-point Likert scale, where Far Below Average = 3, Below Average = 2, Somewhat Below Average = 1, Average = 0, Somewhat Above Average = -1, Above Average = -2, and Far Above Average = -3. The total score is the sum of responses and ranges from -54 to 54; the lower the score, the higher the severity of ADHD symptoms.

This outcome was not analyzed/assessed among participants in Part 1 of the trial (3 mg/kg and 6 mg/kg CBD arms).

Participants who received 98% pure CBD: 6 mg/kg/day in Part 1 of the study.

Participants who received 98% pure CBD: 9 mg/kg/day in Part 2 of the study.