Descriptor
| Age Differences | 2 |
| Genetics | 2 |
| Heredity | 2 |
| Intelligence Differences | 2 |
| Sex Differences | 2 |
| Adults | 1 |
| Autism | 1 |
| Biochemistry | 1 |
| Children | 1 |
| Clinical Diagnosis | 1 |
| Comparative Analysis | 1 |
| More ▼ | |
Publication Type
| Journal Articles | 2 |
| Reports - Research | 2 |
Education Level
Audience
| Researchers | 1 |
Location
Laws, Policies, & Programs
Assessments and Surveys
What Works Clearinghouse Rating
Peer reviewedPiven, Joseph; And Others – Journal of Autism and Developmental Disorders, 1991
Platelet serotonin (5HT) levels of 5 autistic subjects (ages 16-37) who had siblings with either autism or pervasive developmental disorder were significantly higher than levels of 23 autistic subjects without affected siblings. Autistic subjects without affected siblings had 5HT levels significantly higher than 10 normal controls. Sex, age, and…
Descriptors: Adults, Age Differences, Autism, Biochemistry
Peer reviewedPennington, Bruce F.; And Others – Journal of Learning Disabilities, 1992
This study of 640 twins with reading disability and 436 controls (mean age 12) examined external validity of the distinction between specific reading retardation and reading backwardness, in 3 domains: genetic etiology, sex ratio and clinical correlates, and neuropsychological profiles. There was no evidence of differential genetic etiology of the…
Descriptors: Age Differences, Definitions, Educational Diagnosis, Elementary Secondary Education
