Table 2.

Sensitivity and specificity of clock drawing in predicting unsafe driving (n = 122)

Scoring system	Sensitivity	Specificity
7-point (AUC = 0.61, 95% CI = 0.51–0.71)
0	1.00	0.00
1.5	0.99	0.08
2.5	0.91	0.15
3.5	0.78	0.30
4.5	0.69	0.41
5.5	0.43	0.72
6.5	0.18	0.98
8-point (AUC = 0.60, 95% CI = 0.50–0.71)
0	1.00	0.00
1.5	1.00	0.06
2.5	1.00	0.15
3.5	0.95	0.17
4.5	0.89	0.19
5.5	0.86	0.29
6.5	0.72	0.44
7.5	0.50	0.62
10-point (AUC = 0.58, 95% CI = 0.48–0.69)
0	1.00	0.00
1.5	1.00	0.02
2.5	1.00	0.03
3.5	1.00	0.04
4.5	0.97	0.15
5.5	0.90	0.17
6.5	0.82	0.25
7.5	0.77	0.31
8.5	0.62	0.54
9.5	0.34	0.75
Conceptualization (AUC = 0.53, 95% CI = 0.43–0.64)
Yes/No	0.71	0.35

Notes: AUC = area under the curve; CI = confidence interval.