Table 4.

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

Type of visit	Cases (n =204)			Matched controls (n =204)			Difference (case – control)
	Mean	S.D.	Range	Mean	S.D.	Range	tb	p	NNT
Primary care	4.08	3.61	0–24	2.25	1.48	0–8	6.63	<0.0001	2.8
Mental health	4.66	8.33	0–72	0.01	0.21	0–3	7.95	<0.0001	2.4
ER/urgent care	0.50	1.20	0–10	0.05	0.24	0–2	5.17	<0.0001	3.5
Telephone consultations	9.08	10.87	0–100	3.08	2.48	0–15	7.56	<0.0001	2.5
Addiction medicine	0.90	4.93	0–49	0.00	0.00	0.00	2.60	0.01	6.9
Specialty services	6.30	8.01	0–54	3.14	2.74	0–17	5.42	<0.0001	3.4
In-patient care	0.28	1.30	0–12	0.01	0.21	0–3	2.92	0.004	6.2

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

^aComparison plan members were matched to cases by gender, age (within 3 months) and date of index visit (within 3 months).

^bDegrees of freedom=203.