Table 2.

Health services use among women with an eating disorder (cases) and women without an eating disorder (controls) in the 12 months prior to the index visit^a

Type of visit	Cases (n =204)			Matched controls (n =204)			Diffeence (case – control)
	Mean	S.D.	Range	Mean	S.D.	Range	tb	p	NNT
Primary care	2.88	2.93	0–16	1.68	1.18	0–6	5.50	<0.0001	3.3
Mental health	1.63	4.51	0–44	0.01	0.14	0–2	5.13	<0.0001	3.6
ER/urgent care	0.29	0.65	0–3	0.02	0.17	0–2	5.65	<0.0001	3.2
Telephone consultations	5.24	5.63	0–33	2.16	1.95	0–13	7.72	<0.0001	2.4
Addiction medicine	0.09	0.69	0–9	0.00	0.00	0.00	1.92	0.056*	9.3
Specialty services	4.16	6.92	0–64	1.96	1.91	0–12	4.40	<0.0001	4.1
In-patient care	0.45	2.23	0–25	0.03	0.31	0–4	2.67	0.008	6.8

S.D., Standard deviation; NNT, number needed to take; ER, emergency room.

^aComparison plan members were matched to cases on gender, age (within 3 months), and date of index visit (within 3 months). Paired-sample t tests and the Wilcoxon signed rank test yield similar results, except as noted.

^bDegrees of freedom=203.

^*p<0.01 (Wilcoxon signed rank test).