Table 1 Performance of the different methods for classifying fixation as central vs para-central
From: New pediatric vision screener, part II: electronics, software, signal processing and validation
Simple threshold (method 1) | Discriminant analysis (method 2) | |||
|---|---|---|---|---|
2D | 3D | 4D | ||
\(\frac{{\left( {P_{2.5} + P_{6.5} } \right)}}{{P_{4.5} }}\) | \(\frac{{\left( {P_{2.5} + P_{6.5} } \right)}}{{P_{4.5} }} vs \frac{{\left( {P_{3.5} + P_{5.5} } \right)}}{{P_{4.5} }}\) | \(\frac{{P_{6.5} }}{{P_{4.5} }} vs \frac{{P_{2.5} }}{{P_{4.5} }} vs \frac{{\left( {P_{3.5} + P_{5.5} } \right)}}{{P_{4.5} }}\) | \(\frac{{P_{6.5} }}{{P_{4.5} }}\, vs \frac{{P_{2.5} }}{{P_{4.5} }}\, vs \frac{{P_{3.5} }}{{P_{4.5} }}\, vs\frac{{P_{5.5} }}{{P_{4.5} }}\) | |
θ = 0.8750 | a 0 = 0.743, a 1 = 0.318 | a 0 = 0.768, a 1 = 0.056, a 2 = −0.289 | a 0 = 0.779, a 1 = 0.016, a 2 = −0.283, a 3 = 0.083 | |
Sensitivity | 0.9917 | 0.9083 | 0.9417 | 0.9417 |
Specificity | 0.9625 | 0.9771 | 1.0000 | 1.0000 |