Table 10.
Predictive Value (% or ratio) of Different Deficit Profiles
| Variable | PA only | PA | L only | L | PS/NS only | PS/NS | Any Single | 2–3 Deficits | Any Deficit |
|---|---|---|---|---|---|---|---|---|---|
| CLDRC | |||||||||
| Sens | 16.9 | 67.5 | 9.6 | 39.8 | 6.0 | 47.0 | 32.5 | 45.8 | 78.3 |
| - | - | - | - | - | - | - | - | - | |
| Spec | 97.2 | 95.0 | 95.7 | 93.3 | 96.5 | 94.1 | 89.4 | 96.9 | 86.3 |
| 99.0 | 98.2 | 96.4 | 95.3 | 97.7 | 96.6 | 93.1 | 98.5 | 91.7 | |
| PPP | 40.0 | 60.2 | 20.0 | 39.8 | 16.1 | 47.0 | 25.5 | 62.3 | 38.9 |
| 70.0 | 83.6 | 26.7 | 53.2 | 26.3 | 65.0 | 39.1 | 80.8 | 56.0 | |
| NPP | 91.3 | 96.3 | 90.5 | 93.3 | 90.2 | 94.1 | 92.2 | 94.1 | 97.3 |
| 89.8 | 95.7 | 88.7 | 92.1 | 88.4 | 93.1 | 91.1 | 93.1 | 96.9 | |
| ILTS | |||||||||
| Sens | 15.9 | 41.5 | 2.4 | 19.5 | 22.0 | 42.7 | 40.2 | 28.0 | 68.3 |
| - | - | - | - | - | - | - | - | - | |
| Spec | 96.7 | 93.5 | 93.7 | 90.9 | 96.1 | 93.5 | 86.5 | 96.0 | 82.7 |
| 98.0 | 96.2 | 94.0 | 92.4 | 96.7 | 95.2 | 88.7 | 97.7 | 86.4 | |
| PPP | 35.1 | 42.7 | 4.2 | 19.5 | 39.1 | 42.7 | 25.2 | 44.2 | 30.8 |
| 52.0 | 59.6 | 5.3 | 25.8 | 47.4 | 54.7 | 32.7 | 62.1 | 40.6 | |
| NPP | 91.0 | 93.5 | 89.5 | 90.9 | 91.6 | 93.5 | 92.8 | 92.2 | 95.8 |
| 89.5 | 92.4 | 87.6 | 89.4 | 90.1 | 92.4 | 91.6 | 90.9 | 95.2 |
Note. CLDRC = Colorado Learning Disabilities Research Center; ILTS = International longitudinal Twin Study; Sens = Sensitivity; Spec = Specificity; PPP = Positive Predictive Power; NPP = Negative Predictive Power – all expressed as percentages. All subject are included in the first row of each variable, and borderline subjects have been removed from the second row.