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. Author manuscript; available in PMC: 2020 Aug 21.
Published in final edited form as: Child Youth Serv Rev. 2019 Mar 6;101:23–32. doi: 10.1016/j.childyouth.2019.03.002

Table 2.

Marginal Cost Estimates

Equation Type of Mentoring Marginal Cost per Youth by Mentoring Period
One Month Average
Match Length		 One Year
Match Length
Regresson
Estimate		 [95% Confidence
Interval]		 AIC Equations 3a-b Equations 3a-b
1 Both programs $79.64 *** [47.19 to 112.08] 2205 $1,503.22 $955.68
1b CBM $115.60 * [−1.51 to 232.63] 2007 $2,315.69 $1,387.20
SBM - [−305.86 to 287.80] $841.39 † $955.68 †
2 Both programs New Match Month $471.60 ** [23.91 to 919.40] 2204 $471.60 $471.60
Returning Months $68.83 *** [33.91 to 103.76] $658.35 $757.13
Total $1,129.95 $1,228.73
2b CBM New Match Month $1,398.00 *** [403.77 to 2,391.31] 2204 $1,398.00 $1,398.00
Returning Months $100.00 * [−14.62 to 214.62] $1,903.19 $1,100.00
Total $3,301.19 $2,498.00
SBM New Match Month - [−689.06 to 592.45] $471.60 $471.60
Returning Months - [−315.36 to 268.42] $727.18 $757.13
Total $1,198.78 † $1,228.73 †

The Akaike information criterion (AIC) is an estimator of the relative quality of statistical models, the lower the number the better the model fit. Asterisks indicate the estimate’s level of statistical significance

***

is greater than 99%

**

greater than 95%

*

is greater than 90%, and “-” means the value was not statistically significant.

†

The one-month cost estimates for SBM were not statistically significant. The average and one-year match length estimates for SBM are conservative estimates assuming the one month values are at most equal to those from the non-desegregated regressions (i.e. SBM values in Equation 1b use the “one month” estimate from equation 1, and in Equation 2b use the “one month” estimates from Equation 2).