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. 2014 May 4;7:281. doi: 10.1186/1756-0500-7-281

Table 3.

Discriminative value of the ABCD 2 rule to identify patients at high risk of stroke at one and three years

Patients at high risk of stroke (as per international guidelines)
Discrimination (95% confidence interval)
ABCD 2 ≥ 3 (US guidelines) Sensitivity Specificity Area under curve
   1 year
1.00 (0.59 - 1.00)
0.34 (0.24 - 0.45)
0.67 (0.62 – 0.72)
   3 years
0.92 (0.64 - 1.00)
0.36 (0.25 - 0.47)
0.64 (0.55 – 0.73)
ABCD 2 ≥ 4 (UK & New Zealand guidelines)
 
 
 
   1 year
0.86 (0.42 - 1.00)
0.48 (0.36 - 0.59)
0.67 (0.55 – 0.76)
   3 years
0.77 (0.46 - 0.95)
0.49 (0.37 - 0.60)
0.63 (0.50 – 0.76)
ABCD 2 ≥ 5 (Australian guidelines)
 
 
 
   1 year
0.71 (0.29 - 0.96)
0.67 (0.56 - 0.77)
0.69 (0.51 – 0.88)
   3 years 0.62 (0.32 - 0.86) 0.68 (0.57 - 0.79) 0.65 (0.50 – 0.80)