Table 4.
Age (in months) | Area Under Curve | Standard Error | Optimal Thresholda | Youden Index | Sensitivity | Specificity | Positive Predictive Value | Negative Predictive Value | Risk Ratio | |
---|---|---|---|---|---|---|---|---|---|---|
Autism/ASD vs. other delays | 6 | .68 | 0.12 | 2 | 0.33 | 0.33 | 1.00 | 1.00 | 0.74 | 3.83 |
12 | .74** | 0.08 | 1 | 0.42 | 0.82 | 0.60 | 0.58 | 0.83 | 3.50 | |
18 | .71* | 0.08 | 2 | 0.34 | 0.57 | 0.77 | 0.60 | 0.75 | 2.40 | |
(Autism/ASD + other delays) vs. low-risk typical | 6 | .47 | 0.08 | 2 | 0.01 | 0.12 | 0.89 | 0.43 | 0.58 | 1.02 |
12 | .61 | 0.06 | 1 | 0.21 | 0.57 | 0.64 | 0.51 | 0.69 | 1.65 | |
18 | .67*** | 0.05 | 2 | 0.27 | 0.36 | 0.92 | 0.77 | 0.64 | 2.16 |
ASD, autism spectrum disorders.
Threshold based on Youden's index36 (max [sensitivityI + Specificityi − 1]).
p < .05.
p < .01.
p < .001.