Appendix table 3.

Estimated age-of-onset and persistence of DSM-IV eating disorders by lifetime treatment status

	Anorexia Nervosa		Bulimia Nervosa		Binge-eating Disorder
	I. Means
	Mean	(se)	Mean	(se)	Mean	(se)
A. Treated
Age-of-onset	17.8	(1.1)	24.8	(2.3)	25.1	(2.0)
Years with episode	1.7	(0.3)	8.0*	(1.9)	12.6*	(2.3)
12-month persistence	0.0	--	44.7	(9.7)	42.1	(7.9)
B. Untreated
Age-of-onset	19.5	(0.8)	18.1	(1.4)	25.6	(1.6)
Years with episode	1.8	(0.3)	8.6*	(2.1)	4.9*	(0.7)
12-month persistence	0.0	--	19.8	(7.8)	45.8	(8.9)
C. Total
Age-of-onset	18.9	(0.8)	19.7	(1.3)	25.4	(1.2)
Years with episode	1.7	(0.2)	8.3*	(1.6)	8.1*	(1.1)
12-month persistence	0.0	--	30.6	(7.2)	44.2	(6.0)
	II. Medians
	Median	(IQR)	Median	(IQR)	Median	(IQR)
A. Treated
Age-of-onset	17.0	(15.0–21.0)	18.0*	(16.0–20.0)	21.0*	(16.0–30.0)
Years with episode	1.0	(1.0–2.0)	4.0*	(2.0–13.0)	5.0*	(2.0–20.0)
12-month persistence	0.0	--	0.0	(0.0–1.0)	0.0	(0.0–1.0)
B. Untreated
Age-of-onset	21.0	(17.0–22.0)	17.0*	(13.0–20.0)	19.0*	(16.0–32.0)
Years with episode	1.0	(1.0–1.0)	6.0*	(2.0–17.0)	3.0*	(1.0–8.0)
12-month persistence	0.0	--	0.0	(0.0–0.0)	0.0	(0.0–1.0)
C. Total
Age-of-onset	18.0	(16.0–22.0)	18.0	(14.0–22.0)	21.0	(17.0–32.0)
Years with episode	1.0	(1.0–1.0)	5.0*	(2.0–15.0)	3.0*	(1.0–10.0)
12-month persistence	0.0	--	0.0	(0.0–1.0)	0.0	(0.0–1.0)
(n)	(23)		(52)		(115)

^*Significantly different from Anorexia Nervosa based on a .05 level, two-sided test.