CATSS18 - The Child and Adolescent Twin Study in Sweden (18 years)
CATSS18 - The Child and Adolescent Twin Study in Sweden (18 years) Overview CATSS The Child and Adolescent Twin Study in Sweden (CATSS) is an ongoing longitudinal twin study that targets all twins born in Sweden since July 1, 1992. Since 2004, parents of twins have been interviewed about the children's somatic and mental health and social environment in connection with their 9th birthday (CATSS9). At ages 15 (CATSS15) and 18 (CATSS18), twins and parents complete a web questionnaire that, in addition to assessments of somatic and mental health, includes measures of personality development and psychosocial adaptation. At the age of 24 (CATSS24), only twins participate in a web survey that mainly focuses on mental health. CATSS18: CATSS18 started in 2011. The study includes all 18-year-old twins and their parents, regardless of their participation in CATSS9 or CATSS15. The response rate is 50% for the twin survey and 40% for the parent survey. The sample comprises both identical (monozygotic) and fraternal (dizygotic) twins, including same-sex and opposite-sex pairs. The total number of participating twins (through parent and/or twin participation) is currently 20,400 out of 35,800 invited twins (December 2024). The combined response rate is 57%. Participants who have not yet provided a DNA sample via saliva are requested to do so. The saliva sample is used for zygosity determination and genotyping. Currently, 12,700 twins have been genotyped in CATSS18 (December 2024). The question areas in the CATSS18 surveys are listed below. For detailed information about variables, visit strdata.se. Question areas in parent survey: ABCL - Adult Behavior Checklist A-TAC - Autism - Tics, ADHD and other Comorbidities inventory (only Autism-questions) Demography Asthma Eating disorders LEC - Life Events Checklist LSC-R - Life Stressor Checklist MDQ - Mood Disorder Questionnaire PCR - Parent Child Relationship PPCP - Parents' Perception of Child's Peers PLE - Psychotic-like Experiences Parents physical activity Social Interventions Spare Time Activities Question areas in twin survey: AUDIT - Alcohol Use Disorders Identification Test A-TAC - Autism - Tics, ADHD and other Comorbidities inventory (only Autism-questions) BOCS - Brief Obsessive Compulsive Scale CES-D - Center for Epidemiologic Studies Depression Scale CMRS- Child Mania Rating Scale Demography DAWBA - Development and Well-Being Assessment DUDIT - Drug Use Disorders Identification Test DSM-IV Criteria for Major Depressive Episode DCQ - Dysmorphic Concerns Questionnaire EDI-2 - Eating Disorder Inventory - 2 Friends' Behavior HRS-I - Hoarding Rating Scale-Interview LEC - Life Events Checklist LHA - Life History of Aggression LSC-R - Life Stressor Checklist- Revised Love Relationship MDQ - Mood Disorder Questionnaire Nicotine Use PCR - Parent Child Relationship Phobias Physical Activity PLE - Psychotic-like Experiences Premenstrual syndrome Quality of Friendship SCARED - Screen for Child Anxiety Related Emotional Disorders SRD - Self-Reported Delinquency Sexuality Social Interventions Spare Time Activities Synesthesia TCI - Temperament and Character Inventory YPI - Youth Psychopathic Traits Inventory Weight & height
