Table 2.

Rates of Dual-energy X-ray Absorptiometry (DXA) Completion and Osteoporosis Detection and Number Needed to Self-Refer for One Additional DXA and One Additional Osteoporosis Diagnosis by Each Health Plan Location and by Intervention Group

	Outcome: Any DXA		Outcome: DXA Showing Osteoporosis
Health Plan Location, Intervention Group, and Type of Contact	DXA Completion Rate, %	Number of Women Needed to Contact to Identify One DXA (95% CI)	Osteoporosis Diagnosis Rate, %	Number of Women Needed to Contact to Identify One Woman with Osteoporosis (95% CI)
Kaiser Permanente Northwest	n = 8,879
Letter inviting self-referral	24.1*	5.4 (4.9-6.0)	1.6*	43.3 (33.1-62.3)
Letter Inviting Self-Referral with Patient Educational Materials	23.4*	5.5 (5.0-6.1)	1.4*	43.9 (34.0-62.1)
Usual Care (none)	Reference	-	-	-
Kaiser Permanente Georgia	n = 3,249
Letter Inviting Self-Referral Only	13.4†	11.8 (9.1-16.4)	1.0*	81.9 (48.3-269.8)
Letter inviting Self-Referral with Patient Educational Materials	13.0‡	12.3 (9.9-17.6)	0.9*	100.5 (55.2-558.7)
Usual Care	Reference	-	-	-

^*p < 0.001 versus usual care

^†p = 0.003 versus usual care

^‡p = 0.04 versus usual care