Trial of Sertraline to Treat Children With Fragile X Syndrome

Fragile X Syndrome Clinical Trial

Official title:

A Controlled Trial of Sertraline in Young Children With Fragile X Syndrome

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT01474746
• Other study ID #: 271070
• Secondary ID: R40MC22641
• Status: Completed
• Phase: Phase 2
• First received: November 10, 2011
• Last updated: August 25, 2017
• Start date: January 2012
• Est. completion date: September 2015

Study information

• Verified date: August 2017
• Source: University of California, Davis
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This study is a control trial of sertraline (Zoloft) in fragile X syndrome children aged 2 years to 5 years 8 months old. The trial is six months long, and each participant will receive a series of tests at both the beginning and end of the study. The researchers hope to show improvements in language and a decrease in autistic symptoms.

Description:

This is a single center study and the UC Davis MIND Institute for fragile X syndrome (FXS) patients aged between 2 years and 5 years, 8 months old funded by the Health Resources and Services Administration (HRSA). It is a double-blind control trial of sertraline (Zoloft), an anti-depressant typically used in the treatment of depression, obsessive-compulsive disorder, panic disorder, and other conditions. The researchers are investigating the use of this selective serotonin reuptake inhibitor (SSRI) in FXS because a retrospective study has shown significant improvements in language and decreases in autistic behavior. There is also emerging evidence regarding the stimulation of brain-derived neurotrophic factor (BDNF) and the stimulation of neurogenesis when an SSRI is given early on in the development of animal models of Down syndrome. The researchers hope to see improvements in language stimulation, social gaze and social reciprocity, spatial attention, and a decrease in autistic behaviors.

The aim of this study is to carry out a double-blind placebo controlled trial of sertraline in children with FXS who are between the ages of 2 years and 5 years, 8 months old. At baseline, the researchers will assess behavioral and cognitive development. These children will be treated for six months with either sertraline or placebo. At the end of the six months, the researchers assess the same behavioral and cognitive measures as at the beginning of the study. The researchers will also assess the side effects of the sertraline treatment throughout the study.

On March 14, 2017 two secondary outcomes for each of the primary outcomes were added for clarification of measurements at baseline visit and at six-month visit. In April 2017 additional updates were made to report primary and secondary outcome results. By June 2, 2017 all outstanding secondary outcome results had been added.

In July 2017, additional updates to the outcome measures and limitations sections were made to address PRS review comments. In the process of responding to these comments, a duplicate reported outcome measure was identified and deleted.

In August 2017, additional updates to the outcome measures were made to address PRS review comments issued in response to the July 2017 updates.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 57
• Est. completion date: September 2015
• Est. primary completion date: August 2015
• Accepts healthy volunteers: No
• Gender: All
• Age group: 24 Months to 68 Months

Eligibility

Inclusion Criteria:

• Fragile X Syndrome

Exclusion Criteria:

• Current or past SSRI treatment

• Current or past MAOI (monoamine oxidase inhibitor ) treatment

• Serious co-morbid medical disorder affecting brain function and behavior (not including fragile X syndrome).

• Uncontrolled seizure disorder or epilepsy

• Bipolar disorder

• Latex allergies

Related Conditions & MeSH terms

• Fragile X Syndrome
• Syndrome

Intervention

Drug:
• Sertraline
Liquid sertraline (20 mg/mL) will be dosed in an age-dependent manner. Participants aged 2-3 years of age will be given 2.5 mg (0.125 mL) of liquid sertraline once per day for a period of six months. Participants aged 4 years to 5 years 8 months will be given 5 mg (0.25 mL) of liquid sertraline once per day for a period of six months.
• Placebo
The placebo will be dosed in an age-dependent manner. Participants aged 2-3 years of age will be given 2.5 mg (0.125 mL) of liquid placebo once per day for a period of six months. Participants aged 4 years to 5 years 8 months will be given 5 mg (0.25 mL) of liquid placebo once per day for a period of six months.

Locations

Country	Name	City	State
United States	UC Davis M.I.N.D. Institute	Sacramento	California

Sponsors (1)

Lead Sponsor	Collaborator
Randi J. Hagerman, MD

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Change in Mullen Scales of Early Learning - Expressive Language Raw Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the baseline and 6-month follow-up raw scores from the expressive language scale. This scale's raw scores range from 0 to 50. The lower the score on this scale, the weaker the ability; the higher the score, the greater the ability. The MSEL was administered at the baseline visit and at the 6-month follow-up visit.	From baseline visit to six-month visit.
Primary	Clinical Global Impression - Improvement	The Clinical Global Impression - Improvement (CGI-I) is used to measure the overall behavioral change of an individual and their therapeutic response. The CGI-I is a 3-item observer-rated scale administered by the physician to the caregiver, who assesses improvement using a 7-point scale: 1 = Very much improved; 2 = Much improved; 3 = Minimally improved; 4 = No change; 5 = Minimally worse; 6 = Much worse; and 7 = Very much worse. Therefore, the lower the score, the greater the behavioral improvement as rated by the caregiver. Shown here are the CGI-I mean scores from the 6-month follow-up visit.	6-month follow-up visit score
Primary	Change in Mullen Scales of Early Learning - Expressive Language Standard T Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language and expressive language. Based on the raw score obtained by the participant in each scale the scoring software computes T scores, percentile ranks, and age equivalents for each scale separately. Shown here are the baseline and 6-month follow-up T scores from the expressive language scale. T scores have a range of 20 to 80, a mean of 50, and a standard deviation of 10. Any child scoring at or below 1.5 standard deviations below the average is considered presenting significant delays. The lower the T score, the worse the outcome. The MSEL was administered at the baseline visit and at the 6-month follow-up visit.	From baseline visit to six-month visit
Secondary	Autism Diagnostic Observation Schedule	The Autism Diagnostic Observation Schedule (ADOS-2) assesses and diagnoses autism spectrum disorder. This test was administered at baseline and at the six-month follow-up visit. The choice to administer Module 1 or Module 2 depends on the verbal ability of each subject: Module 1 is used for children who are 31 months and older and/or who do not consistently use phrase speech, and Module 2 is used for children of any age who use phrase speech but are not verbally fluent. The scoring algorithm gives an overall total, which ranges from 0 to 28. The higher the score, the higher the level of autism-related symptoms. The overall total ranges from 0 to 28. On Module 1, for children with few to no words, scores at 11 and above indicate autism spectrum; for children with some words, the cutoff is scores 8 and above. On Module 2, the cutoff for autism spectrum is 7 or above for kids under 5 years, and 8 or above for those 5 years and older.	At baseline visit
Secondary	Visual Analog Scale	The Visual Analog Scale will be used to measure the severity of three specific behavioral symptoms chosen by the caregiver(s). Parents mark on a visual line measuring 10 cm with "worst behavior" at 0 cm and "best behavior" at 10 cm. The parents choose two key behaviors that they want to target for this trial (e.g., aggression, hyperarousal, anxiety, hyperactivity) and the third target measurement is language/communication. For each behavior the caregiver is instructed to mark their impression of the behavior at baseline visit and again at the 6-month visit. The calculated distance in cm between the baseline and 6-month visit marks thereby demonstrates whether each behavior improved, worsened, or stayed the same during the study, and by how much. Shown here is the mean distance in cm from the "worst behavior" side, at baseline. The smaller the value, the worse the behavior. The range is minimum 0 cm to maximum 10 cm.	At baseline visit
Secondary	Eye Tracking	There are several eye tracking measures, each intended to measure different outcomes including social gaze, social reciprocity, and attention. All stimuli are presented on a Tobii T120 binocular eye tracker monitor. The system consists of a high-resolution camera embedded in a 17-inch TFT monitor. Stimuli consist of sixty colored photographs of adult human face (equal numbers of males and females, different races and ethnicities) from the NimStim Face Stimulus Set, each showing a calm, happy, or fearful expression, and sixty scrambled versions of the face images. Shown here are the averaged response times (in seconds) to the presented stimuli, at the baseline visit.	At baseline visit
Secondary	Preschool Language Scale-fifth Edition (PLS-5): AC+EC Total Raw Score	The Preschool Language Scale-fifth edition (PLS-5) is designed to measure auditory comprehension (AC) and expressive communication (EC) for children birth to 7 years 11 months. The measure examines the child's attention, play, gestures, social communication, semantics, language structure, integrative language skills and emergent literacy skills. The PLS-5 has expanded coverage of early play behaviors, concepts, Theory of Mind, as well as emergent literacy skills. The PLS-5 yields norm-referenced scores including standard scores, percentile ranks and age equivalents for the AC and EC scales as well as for Total Language (TL). Raw score ranges are 0 to 65 in AC, 0 to 67 in EC, and therefore 0 to 132 in TL (calculated by summing AC+EC raw scores). The higher the scores, the greater the language ability. Shown here are the mean TL raw scores from the baseline visit.	At baseline visit
Secondary	Sensory Processing Measure - Preschool (SPM-P) Social Participation: Raw Score	The Sensory Processing Measure - Preschool (SPM-P) is a questionnaire that was used to measure specific problems, including under- and over-responsiveness, sensory-seeking behavior, and perceptual problems in multiple environments (at home, at school, and in the community) for children aged 2 to 5 years old. The SPM-P provides norm-referenced standard scores for two higher level integrative functions (praxis and social participation) and five sensor sensory systems (visual, auditory, tactile, proprioceptive, and vestibular functioning). Reported here is the Social Participation subscale mean raw score, which ranges from 8 to 32. The lower the raw score, the more limited the child's level of social participation. The higher the score, the greater the child's level of social participation.	At baseline visit
Secondary	Sensory Profile - Sensation Seeking Subscale Raw Score	The Sensory Profile is designed to measure sensory-related difficulties. This measure will be administered to the primary caregiver of each subject to measure the caregiver's sensory ability and its impact on the subject. Of the four subscales scored in the Sensory Profile, the "Sensation Seeking" subscale mean raw scores for the placebo and treatment groups are reported here. This subscale has a raw scores range from 0 to 95, with scores 0-6 indicating that the child is sensation seeking much less than others, 7-19 less than others, 20-47 just like the majority of others, 48-60 more than others, and 61-95 much more than others.	At baseline visit
Secondary	Vineland Adaptive Behavior Scales, Second Edition (Vineland-II) - Adaptive Behavior Composite Standard Score	The Vineland-II measures the personal and social skills of individuals from birth through adulthood. It was designed to assess handicapped and non-handicapped persons in their personal and social functioning and is appropriate for individuals of all ages. The Vineland-II is a survey that is administered to a parent or caregiver using a semi-structured interview format and is organized around four Behavior Domains: Communication, Daily Living Skills, Socialization, and Motor Skills. Each subtest is scored with a standard score X=100 ± 15 and summed to calculate the Adaptive Behavior Composite (ABC) using age-adjusted scoring tables. Reported here are the ABC mean standard scores for the placebo and treatment groups baseline. The ABC ranges from 20 to 160 and indicates low (20-70), moderately low (70-85), adequate (85-115), moderately high (115-130), or high (130-160) overall adaptive functioning.	At baseline visit
Secondary	Mullen Scales of Early Learning - Visual Reception Raw Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the mean baseline raw scores from the Visual Reception scale. This scale's raw scores range from 0 to 50. The lower the score on this scale, the weaker the child's ability for visual reception; the higher the score, the greater the ability for visual reception.	At baseline visit
Secondary	Mullen Scales of Early Learning - Fine Motor Raw Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the mean raw scores from the Fine Motor scale at the baseline visit. This scale's raw scores range from 0 to 49. The lower the score on this scale, the weaker the child's fine motor skills; the higher the score, the greater the child's fine motor skills.	At baseline visit
Secondary	The Autism Diagnostic Observation Schedule (ADOS-2)	The Autism Diagnostic Observation Schedule (ADOS-2) assesses and diagnoses autism spectrum disorder. This test was administered at baseline and at the six-month follow-up visit. The choice to administer Module 1 or Module 2 depends on the verbal ability of each subject: Module 1 is used for children who are 31 months and older and/or who do not consistently use phrase speech, and Module 2 is used for children of any age who use phrase speech but are not verbally fluent. The scoring algorithm gives an overall total, which ranges from 0 to 28. The higher the score, the higher the level of autism-related symptoms. The overall total ranges from 0 to 28. On Module 1, for children with few to no words, scores at 11 and above indicate autism spectrum; for children with some words, the cutoff is scores 8 and above. On Module 2, the cutoff for autism spectrum is 7 or above for kids under 5 years, and 8 or above for those 5 years and older.	At six month visit
Secondary	The Visual Analog Scale	The Visual Analog Scale will be used to measure the severity of three specific behavioral symptoms chosen by the caregiver(s). Parents mark on a visual line measuring 10 cm with "worst behavior" at 0 cm and "best behavior" at 10 cm. The parents choose two key behaviors that they want to target for this trial (e.g., aggression, hyperarousal, anxiety, hyperactivity) and the third target measurement is language/communication. For each behavior the caregiver is instructed to mark their impression of the behavior at baseline visit and again at the 6-month visit. The calculated distance in cm between the baseline and 6-month visit marks thereby demonstrates whether each behavior improved, worsened, or stayed the same during the study, and by how much. Shown here is the mean distance in cm from the "worst behavior" side, at the 6-month visit. The smaller the value, the worse the behavior. The range is minimum 0 cm to maximum 10 cm.	At six-month visit
Secondary	Eye Tracking	There are several eye tracking measures, each intended to measure different outcomes including social gaze, social reciprocity, and attention. All stimuli are presented on a Tobii T120 binocular eye tracker monitor. The system consists of a high-resolution camera embedded in a 17-inch TFT monitor. Stimuli consist of sixty colored photographs of adult human face (equal numbers of males and females, different races and ethnicities) from the NimStim Face Stimulus Set, each showing a calm, happy, or fearful expression, and sixty scrambled versions of the face images. Shown here are the averaged response times (in seconds) to the presented stimuli, at the 6-month follow-up visit.	At six-month visit
Secondary	Preschool Language Scale-fifth Edition (PLS-5): AC+EC Total Raw Score	The Preschool Language Scale-fifth edition (PLS-5) is designed to measure auditory comprehension (AC) and expressive communication (EC) for children birth to 7 years 11 months. The measure examines the child's attention, play, gestures, social communication, semantics, language structure, integrative language skills and emergent literacy skills. The PLS-5 has expanded coverage of early play behaviors, concepts, Theory of Mind, as well as emergent literacy skills. The PLS-5 yields norm-referenced scores including standard scores, percentile ranks and age equivalents for the AC and EC scales as well as for Total Language (TL). Raw score ranges are 0 to 65 in AC, 0 to 67 in EC, and therefore 0 to 132 in TL (calculated by summing AC+EC raw scores). The higher the scores, the greater the language ability. Shown here are the mean TL raw scores from the 6-month follow-up visit.	At six-month visit
Secondary	Sensory Processing Measure-Preschool (SPM-P) Social Participation: Raw Score	The Sensory Processing Measure - Preschool (SPM-P) is a questionnaire that was used to measure specific problems, including under- and over-responsiveness, sensory-seeking behavior, and perceptual problems in multiple environments (at home, at school, and in the community) for children aged 2 to 5 years old. The SPM-P provides norm-referenced standard scores for two higher level integrative functions (praxis and social participation) and five sensor sensory systems (visual, auditory, tactile, proprioceptive, and vestibular functioning). The SPM-P was administered to the caregiver at baseline and again at the 6-month follow-up visit. Reported here is the Social Participation subscale mean raw score from the 6-month visit, which ranges from 8 to 32. The lower the raw score, the more limited the child's level of social participation. The higher the score, the greater the child's level of social participation.	At six-month visit
Secondary	Sensory Profile - Sensation Seeking Subscale Raw Score	The Sensory Profile is designed to measure sensory-related difficulties. This measure will be administered to the primary caregiver of each subject to measure the caregiver's sensory ability and its impact on the subject. Of the four subscales scored in the Sensory Profile, the "Sensation Seeking" subscale mean raw scores for the placebo and treatment groups are reported here. This subscale has a raw scores range from 0 to 95, with scores 0-6 indicating that the child is sensation seeking much less than others, 7-19 less than others, 20-47 just like the majority of others, 48-60 more than others, and 61-95 much more than others.	At six-month visit
Secondary	Vineland Adaptive Behavior Scales, Second Edition (Vineland-II) Adaptive Behavior Composite Standard Score	The Vineland-II measures the personal and social skills of individuals from birth through adulthood. It was designed to assess handicapped and non-handicapped persons in their personal and social functioning and is appropriate for individuals of all ages. The Vineland-II is a survey that is administered to a parent or caregiver using a semi-structured interview format and is organized around four Behavior Domains: Communication, Daily Living Skills, Socialization, and Motor Skills. Each subtest is scored with a standard score X=100 ± 15 and summed to calculate the Adaptive Behavior Composite (ABC) using age-adjusted scoring tables. Reported here are the ABC mean standard scores for the placebo and treatment groups at the 6-month visit. The ABC ranges from 20 to 160 and indicates low (20-70), moderately low (70-85), adequate (85-115), moderately high (115-130), or high (130-160) overall adaptive functioning.	At six-month visit
Secondary	Mullen Scales of Early Learning - Visual Reception Raw Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the mean raw scores from the Visual Reception scale at the 6-month follow-up visit. This scale's raw scores range from 0 to 50. The lower the score on this scale, the weaker the child's ability for visual reception; the higher the score, the greater the ability for visual reception.	At six-month visit
Secondary	Mullen Scales of Early Learning - Visual Reception Age-equivalent Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the mean baseline age-equivalent scores from the Visual Reception scale. This scale's age-equivalent scores for each of the five scales are calculated from the raw scores for each scale, using the MSEL Age Equivalents table. Age-equivalent scores for each scale range from 0 to 70 months, with lower scores indicating that a child's visual reception is at a level typical of younger ages, and higher scores indicating that a child's visual reception is at a level typical of older ages.	At baseline visit
Secondary	Mullen Scales of Early Learning - Visual Reception Age-equivalent Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the mean age-equivalent scores from the Visual Reception scale at the 6-month follow-up visit. This scale's age-equivalent scores for each of the five scales are calculated from the raw scores for each scale, using the MSEL Age Equivalents table. Age-equivalent scores for each scale range from 0 to 70 months, with lower scores indicating that a child's visual reception is at a level typical of younger ages, and higher scores indicating that a child's visual reception is at a level typical of older ages.	At six-month visit
Secondary	Mullen Scales of Early Learning - Fine Motor Raw Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the mean raw scores from the Fine Motor scale at the 6-month follow-up visit. This scale's raw scores range from 0 to 49. The lower the score on this scale, the weaker the child's fine motor skills; the higher the score, the greater the child's fine motor skills.	At six-month visit
Secondary	Mullen Scales of Early Learning - Fine Motor Age-equivalent Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the mean baseline age-equivalent scores from the Fine Motor scale. This scale's age-equivalent scores for each of the five scales are calculated from the raw scores for each scale, using the MSEL Age Equivalents table. Age-equivalent scores for each scale range from 0 to 70 months, with lower scores indicating that a child's fine motor skills are at a level typical of younger ages, and higher scores indicating that a child's fine motor skills are at a level typical of older ages.	At baseline visit
Secondary	Mullen Scales of Early Learning - Fine Motor Age-equivalent Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language, and expressive language. Shown here are the mean age-equivalent scores from the Fine Motor scale at the 6-month follow-up visit. This scale's age-equivalent scores for each of the five scales are calculated from the raw scores for each scale, using the MSEL Age Equivalents table. Age-equivalent scores for each scale range from 0 to 70 months, with lower scores indicating that a child's fine motor skills are at a level typical of younger ages, and higher scores indicating that a child's fine motor skills are at a level typical of older ages.	At six-month visit
Secondary	Mullen Scales of Early Learning - Cognitive T Score Sum	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor (not administered because it was out of age range for most subjects), visual reception, fine motor, receptive language and expressive language. Based on the raw score obtained by the participant in each scale, the scoring software computes T scores for each scale separately. Each scale's T score has a range of 20 to 80, a mean of 50, and a standard deviation of 10, and the lower the T score, the lower the child's cognitive and developmental ability. Cognitive T score sum is the sum of the T scores for each scale administered; since 4 scales were administered, the sum's range is 80 to 320, with lower sums indicating lower overall ability. The MSEL was administered at the baseline visit and at the 6-month follow-up visit, and mean baseline cognitive T score sums for the placebo and treatment groups are shown here.	At baseline visit
Secondary	Mullen Scales of Early Learning - Cognitive T Score Sum	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor (not administered because it was out of age range for most subjects), visual reception, fine motor, receptive language and expressive language. Based on the raw score obtained by the participant in each scale, the scoring software computes T scores for each scale separately. Each scale's T score has a range of 20 to 80, a mean of 50, and a standard deviation of 10, and the lower the T score, the lower the child's cognitive and developmental ability. Cognitive T score sum is the sum of the T scores for each scale administered; since 4 scales were administered, the sum's range is 80 to 320, with lower sums indicating lower overall ability. The MSEL was administered at the baseline and 6-month follow-up visits, and mean cognitive T score sums from the 6-month follow-up visit for the placebo and treatment groups are shown here.	At six-month visit
Secondary	Mullen Scales of Early Learning - Summary Age-equivalent Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language and expressive language. Based on the raw score obtained by the participant in each scale, the scoring software computes T scores, percentile ranks, and age equivalents for each scale separately, as well as a cognitive T score sum and summary age-equivalent score to characterize overall early developmental ability. Summary age-equivalent scores range from 0 to 70 months, with lower scores indicating that a child's ability is at a level typical of younger ages, and higher scores indicating that a child's ability is at a level typical of older ages. The MSEL was administered at the baseline visit and at the 6-month follow-up visit, and mean baseline summary age-equivalent scores for the placebo and treatment groups are shown here.	At baseline visit
Secondary	Mullen Scales of Early Learning - Summary Age-equivalent Score	The Mullen Scales of Early Learning (MSEL) is a cognitive test to measure cognitive ability and language development. The test has five scales: gross motor, visual reception, fine motor, receptive language and expressive language. Based on the raw score obtained by the participant in each scale, the scoring software computes T scores, percentile ranks, and age equivalents for each scale separately, as well as a cognitive T score sum and summary age-equivalent score to characterize overall early developmental ability. Summary age-equivalent scores range from 0 to 70 months, with lower scores indicating that a child's ability is at a level typical of younger ages, and higher scores indicating that a child's ability is at a level typical of older ages. The MSEL was administered at the baseline visit and at the 6-month follow-up visit, and mean summary age-equivalent scores at the 6-month follow-up visit for the placebo and treatment groups are shown here.	At six-month visit