Table 2. Receiver Operating Characteristic Curve Analysis for STT for Identifying AD.
| AUC& | 95% CI | Cut-off score(s)<$>\scale50%\raster="rg1"<$><$>\scale50%\raster="rg1"<$> | Sensitivity (%) | Specificity (%) | Z (P)# | ||
| Group 1 | STT-A$ | 0.830 | 0.896–0.765 | >80 | 91.7 | 72.1 | 0.36(0.71) |
| STT-B% | 0.913 | 0.959–0.866 | >220 | 92.4 | 75.0 | ||
| Group 2 | STT-A | 0.906 | 0.947–0.864 | >70 | 87.2 | 77.8 | 1.38(0.16) |
| STT-B | 0.880 | 0.939–0.821 | >200 | 90.7 | 72.5 | ||
| Group 3 | STT-A | 0.835 | 0.878–0.791 | >90 | 84.6 | 66.7 | 1.38(0.16) |
| STT-B | 0.816 | 0.870–0.762 | >240 | 76.4 | 69.9 | ||
| Group 4 | STT-A | 0.877 | 0.916–0.838 | >80 | 88.4 | 66.4 | 1.07(0.28) |
| STT-B | 0.874 | 0.915–0.832 | >220 | 89.5 | 67.0 |
Group 1: age ≤65yrs, formal education years ≤12yrs; Group 2: age ≤65yrs, education >12yrs; Group 3: age >65yrs, education ≤12yrs; Group 4: age >65yrs, education >12yrs.
&
AUC: area under the curve; $STT-A: time consumed for STT-Part A; %STT-B: time consumed for STT-Part B; 
cut-off score in seconds.
#
Comparison between STT-A and B of AUC.