Table 3.
Diagnostic efficiency of PC-PTSD-5 total score cut-points and items for detecting probable DSM-5 PTSD status on PCL-5
| Variable | Test performance index | Test quality index | ||||||
|---|---|---|---|---|---|---|---|---|
| SE | SP | PPV | NPV | EEF | κ(1) | κ(0) | κ(.5) | |
| PC-PTSD total score cut-points | ||||||||
| Score ≥ 1* | .99 (.97–1.00) | .24 (.18–.30) | .52 (.46–.57) | .98 (.90–1.00) | .58 (.53–.63) | .96 | .12 | .21 (.16–.27) |
| Score ≥ 2 | .97 (.94–.99) | .48 (.41–.54) | .60 (.55–.66) | .96 (.90–.99) | .70 (.66–.74) | .90 | .28 | .43 (.36–.50) |
| Score ≥ 3 | .94 (.90–.97) | .67 (.60–.73) | .70 (.64–.75) | .93 (.88–.97) | .79 (.75–.83) | .85 | .45 | .59 (.52–.66) |
| Score ≥ 4 | .86 (.80–.90) | .81 (.75–.85) | .78 (.72–.84) | .87 (.82–.92) | .83 (.79–86) | .72 | .61 | .66 (.59–.73) |
| PC-PTSD items | ||||||||
| Item 1 | .86 (.80–.90) | .69 (.62–.74) | .69 (.63–.75) | .85 (.80–.90) | .76 (.72–.80) | .68 | .44 | .53 (.45–.61) |
| Item 2 | .94 (.90–.97) | .51 (.45–.58) | .61 (.55–.67) | .92 (.85–.96) | .71 (.66–.75) | .81 | .30 | .43 (.36–.51) |
| Item 3 | .88 (.82–.92) | .62 (.55–.68) | .65 (.59–.71) | .86 (.80–.91) | .74 (.69–.78) | .70 | .37 | .48 (.41–.56) |
| Item 4* | .91 (.86–.95) | .62 (.55–.68) | .66 (.60–.72) | .89 (.84–.94) | .75 (.70–.79) | .76 | .38 | .51 (.43–.58) |
| Item 5 | .76 (.69–.82) | .69 (.63–.75) | .67 (.60–.73) | .78 (.71–.83) | .72 (.67–.76) | .50 | .40 | .44 (.36–.53) |
N = 422 except when designated by *N = 421. PC-PTSD-5 cut-scores are designated by Score ≥ number (possible PC-PTSD-5 total scores are 0–5). Parentheses indicate 95% confidence interval
SE, Sensitivity; SP, Specificity; PPV, Positive predictive value; NPV, Negative predictive value; EFF, Efficiency/Correct classification rate; κ(1) = quality of SE; κ(0) = quality of SP; κ(.5) = quality of EFF