Table 1.

Descriptive Results for All Study-Eligible Members, Prematching and by Potential Group Assignment

Period	Potential group participation status	Members, N	Age, yrs	Gender, % female	Paid per ED visit, $
1st ED visit	Control	1054	42.0	56.5	1043
	Test	428	41.1	53.5	1068
2nd & subsequent	Control	1054	42.0	56.5	1157
ED visits	Test	428	41.1	53.5	999

NOTE: Decrease for test group in dollars paid by the plan per ED visit = 1068 × (1157/1043) – 999 = $186. ED indicates emergency department.