Table 1.

Overview of assessments in the two twin cohorts.

Twin Cohort
	ATR-II			ATR-III
Phase 1	years	ages	assessments	years	ages	assessments
	1996-2000	24-36	• suicidal behaviors  -age of onset	2005-2009	21-46	• suicidal behaviors  -age of onset (not used) • gambling disorder
			• other psychiatric disorders			• other psychiatric disorders
						• past year income • educational attainment
			4 year retest interview (n = 216)
Phase 2	years	ages	assessments	NA	NA	NA
	2004-2007	32-43	• suicidal behaviors  - age of onset
			• gambling disorder  - gambling activity participation  - age of onset
			• past year income • educational attainment
			3 month retest interview (n = 166)

Note: ATR-III also includes siblings, ATR = Australian Twin Registry