Table 1.

Similarities and differences between the ALSPAC and GSMS longitudinal studies

	ALSPAC	GSMS
Type of study	Longitudinal birth cohort	Longitudinal, population-based community survey
Location	Avon, South West England, UK	North Carolina, USA
Population	14 701 children (alive at 1 year) and their families	1420 children and their parents
Available data collection points	Multiple datapoints since pregnancy until 18 years	Age 9 years through 16 years (early childhood), 19 years, 21 years, and 24–26 years (young adulthood)
Measurement of bullying	Child reports in interviews at ages 8, 10, and 13 years (Bullying and Friendship Interview Schedule)16	The child and their parent reported on whether the child had been bullied or teased or bullied others (part of Child and Adolescent Psychiatric Assessment)24
Measurement of maltreatment	Maternal reports in repeated questionnaires	Child and parent report in repeated interviews
Measurement of mental health problems	Standard clinical interviews for depression, anxiety, and self-harm (CIS-R)25	Interviews: Child and Adolescent Psychiatric Assessment (for 9–16 years) and Young Adult Psychiatric Assessment (for 24–26 years)24

ALSPAC=Avon Longitudinal Study of Parents and Children. GSMS=Great Smoky Mountains Study. CIS-R=Clinical Interview Schedule-Revised.