TABLE B-1.

Intervention Impacts in the Wisconsin 2007 Follow-up Survey Assuming Some Participants Were Not Affected, by Subgroups

	Lower bound impact on predicted cost		Treatment-On-Treated impact on predicted cost		N
	Dollars	Log points	Dollars	Log points
	(1)	(2)	(3)	(4)	(5)
A. Education
Not college graduate	−295* (147)	−0.146* (0.057)	−454* (226)	−0.224* (0.088)	213
College graduate	−196* (80)	−0.146* (0.053)	−325* (132)	−0.242* (0.087)	193
B. Satisfaction rating of 2006 plan
Fair, poor, or unknown	−278 (171)	−0.189* (0.062)	−455 (279)	−0.310* (0.102)	124
Good, very good, or excellent	−192* (85)	−0.122* (0.050)	−310* (137)	−0.196* (0.081)	282
C. Dollar potential savings
≤ $400	−88* (45)	−0.143* (0.064)	−148* (75)	−0.238* (0.106)	216
> $400	−323* (141)	−0.137* (0.048)	−503* (220)	−0.214* (0.075)	190
D. Insurer share of sample in 2006
≤ 0.15	−559* (203)	−0.324* (0.065)	−795* (289)	−0.461* (0.093)	142
> 0.15	−65 (64)	−0.073 (0.047)	−112 (110)	−0.125 (0.081)	264
E. Benefit type in 2006 baseline
Basic	−211 (111)	−0.152* (0.065)	−330 (173)	−0.237* (0.101)	224
Enhanced (with or without Gap Coverage)	−272* (127)	−0.153* (0.044)	−445* (208)	−0.249* (0.072)	182
F. All
Full sample	−229* (83)	−0.143* (0.038)	−365* (132)	−0.228* (0.061)	406

Notes. Estimates are with regression adjustment using the models in Table III, columns 4 and 6, estimated separately for each subgroup, and modified as follows: columns (1) and (2) are based on equation (B2), and multiply the estimates by 1/(0.282+0.168); columns (3) and (4) are based on equation (B3), and multiply the estimates by 1/0.282. All subgroups are defined on characteristics known prior to random assignment. Dollar potential savings = predicted 2007 consumer cost of 2006 plan - predicted consumer cost of least expensive plan in 2007. Standard errors are in parentheses.

^*p-value < 0.05.