title: Age and gender differences in morningness-eveningness during adolescence.
abstract: Morningness-eveningness was assessed in a large sample of adolescents and young adults. Morningness decreased from 12 to 15 years, and then remained on a stable level until about 20 years, when a turn back to morningness occurred. Boys and men were on average more evening-oriented than were girls and women. In detail, significant differences existed at the ages of 16, 18, and 19 years. A quadratic function explained more variance than a linear regression. Composite Scale of Morningness scores are related to puberty scores in boys and girls, and when combining data (i.e., higher pubertal development was related to eveningness).
authors: University of Education Heidelberg, Department of Natural Sciences, Heidelberg, Germany. randler@ph-heidelberg.de
authors: Christoph
authors: C
authors: Randler
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D000297:Psychology, Adolescent; D012737:Sex Factors; D055815:Young Adult