Table 2.
Savings, Costs, and ROI by Year of First Participation and Participation Length
| Category | Savingsa | P value | Costs | Return on investmentb |
|---|---|---|---|---|
| By year of first participation | ||||
| 2009 | -$58 | .789 | $181c | -0.3:1 |
| 2010 | $416 | .055 | $181c | 2.3:1 |
| 2011 | $710 | .028 | $181c | 3.9:1 |
| By duration of participation | ||||
| 1–9 months | -$967 | .002 | $181c | -5.3:1 |
| 10–18 months | -$81 | .727 | $181c | -0.5:1 |
| 19–37 months | $216 | .244 | $181c | 1.2:1 |
| Overall | $250 | .093 | $181c | 1.4:1 |
a
Savings are per member per month (PMPM) and calculated using a second stage regression model after propensity score weighting, where negative savings indicate a loss.
b
Return on investment (ROI) is the ratio of savings to costs, where ROIs greater than 1.0:1 indicate a savings for every dollar invested in the program and ROIs less than 1.0:1 indicate a loss for every dollar invested in the program. For example, the Overall ROI of 1.4:1 indicates that for every $1.00 invested in the program, the program saved $1.40.
c
Costs were based upon a blended cost for all 3 years.