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Table 4 Estimates of several performance measures for different cutoff scores of the Y-ACNAT-NO

From: The development and validation of the Youth Actuarial Care Needs Assessment Tool for Non-Offenders (Y-ACNAT-NO)

Cutoff score (>) a Sensitivity (95% CI) Specificity (95% CI) Positive predictive power (95% CI) Negative predictive power (95% CI) Diagnostic odds ratio (95% CI) NND (95% CI) NSD (95% CI) Youden index
> .000 1.000 (.984 – 1.000) .000 (.000 - .003) .139 (.122 - .156) - - 7.194 (6.410 - 8.197) - .000
> .047 .799 (.741 - .849) .535 (.508 - .561) .217 (.189 - .246) .943 (.925 - .958) 4.567 (3.252 – 6.414) 4.608 (4.065 - 5.291) 16.544 (12.333 – 22.810) .334
> .053 .756 (.695 - .810) .644 (.618 - .668) .254 (.222 - .289) .942 (.926 - .956) 5.575 (4.047 – 7.680) 3.937 (3.460 - 4.505) 16.242 (12.514 – 21.727) .400
> .117 .677 (.612 - .737) .758 (.735 - .780) .311 (.270 - .353) .936 (.920 - .949) 6.564 (4.851 – 8.881) 3.215 (2.833 - 3.704) 14.625 (11.500 – 18.608) .435
> .128 .511 (.444 - .577) .869 (.851 - .886) .386 (.331 - .444) .917 (.901 - .931) 6.942 (5.135 – 9.384) 2.591 (2.252 - 3.021) 11.048 (9.101 – 13.493) .380
> .207 .507 (.440 - .573) .880 (.862 - .896) .404 (.347 - .464) .917 (.901 - .931) 7.510 (5.539 – 10.182) 2.475 (2.155 - 2.882) 11.048 (9.101 – 13.493) .387
> .257 .454 (.388 - .521) .911 (.895 - .925) .450 (.385 - .517) .912 (.896 - .926) 8.484 (6.175 – 11.655) 2.222 (1.934 - 2.597) 10.364 (8.615 – 12.514) .365
> .292 .393 (.329 - .460) .950 (.937 - .961) .559 (.479 - .637) .907 (.891 - .921) 12.320 (8.624 – 17.602) 1.789 (1.570 - 2.088) 9.753 (8.174 – 11.658) .343
> .439 .253 (.198 - .315) .984 (.976 - .990) .716 (.604 - .811) .891 (.875 - .906) 20.631 (12.409 – 34.302) 1.397 (1.233 - 1.656) 8.174 (7.000 – 9.638) .237
> .690 .087 (.054 - .132) .997 (.993 - .999) .833 (.626 - .953) .872 (.854 - .887) 33.923 (11.482 – 100.223) 1.200 (1.049 - 1.597) 6.813 (5.849 – 7.850) .084
>1.000 .000 (.000 - .016) 1.000 (.997 – 1.000) - .861 (.844 - .878) - - 6.194 (5.410 – 7.197) .000
  1. The presented measures pertain to the performance of the Y-ACNAT-NO in the validation sample.
  2. aIf a test score on the Y-ACNAT-NO (i.e., the probability of future care needs) is greater than the cutoff score, the test result is considered positive; otherwise, it is considered negative. The cutoff score with the highest Youden index [J] is indicated in bold.
  3. CI = Confidence interval; NND = Number needed to detain; NSD = Number safely discharged.