Julie Youssef, DO

  • Julie Nessim Youssef

Work and Education

Professional Education

New York College of Osteopathic Medicine, Old Westbury, NY, 5/4/2006


Stony Brook Medicine Pediatric Residency, Stony Brook, NY, 6/30/2009


Children's Hospital Boston, Boston, MA, 6/30/2012

Board Certifications

Developmental Behavioral Pediatrics, American Board of Pediatrics

Pediatrics, American Board of Pediatrics

All Publications

The Role of Primary care clinicians and sub-specialty pediatricians in the diagnosis and management of children with ASD Handbook of Interdisciplinary Treatments for Autism Spectrum Disorder: Youssef, J. N., Won, D. C., Feldman, H. M. Springer Publishing. 2019; 1st
Language Delays Zuckerman Parker Handbook of Developmental and Behavioral Pediatrics for Primary Care Feldman, H. M., Youssef, J. N. Lippincott Williams & Wilkins. 2018; 4th
Assessing Parent Perceptions of Physical Activity in Families of Toddlers with Neurodevelopmental Disorders: The Parent Perceptions of Physical Activity Scale (PPPAS). Pediatric exercise science Lakes, K., Abdullah, M. M., Youssef, J., Donnelly, J., Taylor-Lucas, C., Goldberg, W. A., Cooper, D., Aizik, S. 2017: 132


The purpose of this study was to examine a new tool (PPPAS: Parent Perceptions of Physical Activity Scale-Preschool) developed to study parental perceptions of physical activity (PA) among parents of toddler and preschool age children.143 children (mean age 31.65 months; 75% male) and their parents were recruited from a neurodevelopmental clinic. Parents completed questionnaires, and both a psychologist and a physician evaluated the children. 83% of the children received a diagnosis of Autism Spectrum Disorder; 20% of the children had a BMI > 85(th) percentile. Analyses were conducted to evaluate the reliability, concurrent validity, discriminant validity, and predictive validity of PPPAS scores.Results supported a two-factor structure: Perceptions of the Benefits of PA and the Barriers to PA. The internal consistency of scores was good for both PPPAS subscales, derived from the two factors. Parent perceptions of barriers to PA were significantly correlated with delays in overall adaptive functioning, daily living skills, socialization, and motor skills. When a child's motor skills were delayed, parents were less likely to believe PA was beneficial and perceived more barriers to PA. Parent perceptions of barriers to PA predicted parent-reported weekly unstructured PA and ratings of how physically active their child was compared to other children.We present the PPPAS-Preschool for use in pediatric exercise research and discuss potential applications in the study of parent perceptions of PA in young children.

View details for DOI 10.1123/pes.2016-0213

View details for PubMedID 28486020

Parent Perceptions Of Physical Activity In Toddlers With Autism: Associations With BMI And Sedentary Behavior Lakes, K. D., Abdullah, M., Lucas, C., Youssef, J., Arastoo, S., Viray, L., Guo, Y., Goldberg, W., Radom-Aizik, S. LIPPINCOTT WILLIAMS & WILKINS. 2015: 485
Relationship of Serum Ferritin Levels to Sleep Fragmentation and Periodic Limb Movements of Sleep on Polysomnography in Autism Spectrum Disorders PEDIATRIC NEUROLOGY Youssef, J., Singh, K., Huntington, N., Becker, R., Kothare, S. V. 2013; 49 (4): 274-278


Although children with autism spectrum disorders experience a range of sleep disturbances, exact mechanisms are not well-characterized. We investigated the association of serum-ferritin to sleep fragmentation and periodic limb movements of sleep using polysomnography in children with autism spectrum disorders.We conducted a retrospective chart review of children with autism spectrum disorders followed from 1990 to 2010. Inclusion criteria were availability of polysomnography data and ferritin levels within 12 months of each other. The following variables on polysomnography characterized sleep fragmentation: increased arousal index, alpha intrusions, and reduced sleep efficiency. The data were compared with age- and gender-matched controls.Of 9791 children with autism spectrum disorders identified, 511 had a ferritin level, 377 had polysomnography data, and 53 had both ferritin and polysomnography data. As compared with the controls (86 ng/mL), the median ferritin level was 27 ng/mL in the study autism spectrum disorders population (53 patients) (P < 0.01), 27 ng/mL in autism spectrum disorder subjects with periodic limb movements of sleep (25 patients) (P= 0.01), and 24 ng/mL in autism spectrum disorders subjects with sleep fragmentation (21 patients) (P= 0.02). Within the autism spectrum disorders population, median ferritin levels were significantly lower in patients with poor sleep efficiency (7 ng/mL) versus those with normal sleep efficiency (29 ng/mL) (P= 0.01). The prevalence of periodic limb movements of sleep was 47% in autism spectrum disorders compared with 8% in controls (P < 0.01).Children with autism spectrum disorders had significantly lower ferritin levels compared with controls. In addition, they experience a higher prevalence of sleep fragmentation, obstructive sleep apnea, and periodic limb movements of sleep than children with ASD and no sleep complaints. Our preliminary observations, which have not been described before, need to be validated in multicenter prospective studies.

View details for DOI 10.1016/j.pediatrneurol.2013.06.012

View details for Web of Science ID 000325041200009

View details for PubMedID 24053984

Hours Spent Coordinating Care as a Predictor of Health Status in Caregivers of Children with Developmental Disabilities PM&R Roger, L., Semel, J., Youssef, J., Guralnick, S., Sawyer, L. 2013; 5 (9): S194
Comparing Bodily Pain in Caregivers of Children with Cerebral Palsy Affecting Arms and Legs versus Predominantly Legs PM&R Luo, R., Semel, J., Youssef, J. 2013; 5 (9): S193-S194
Periodic limb movements of sleep, serum-ferritin levels, and sleep fragmentation on polysomnogram in Autism Spectrum Disorder Youssef, J. N., Huntington, N., Gregas, M., Loddenkemper, T., Becker, R., Kothare, S. WILEY-BLACKWELL. 2011: S126