Table 1 OX-NDA Domain Classification, Scoring Formulae and Interpretation
OX-NDA domain | Number of items contributing to domain | Range for item scores | Constituent item numbers for domain | Raw domain score estimation | Scaling formula for conversion of raw domain scores to standardized scores (range 0-100) | Interpretation of domain score |
|---|---|---|---|---|---|---|
Cognition | 15 | 1 - 4 | 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16 | Mean of constituent item scores | ((x – 1) / 3)) * 100 | Higher score reflects better performance |
Motor | 8 | 1 - 4 | 12, 17, 18, 22, 23, 24, 25, 26 | Mean of constituent item scores | ((x – 1) / 3)) * 100 | Higher score reflects better performance |
Language | 7 | 1 - 4 | 19, 20, 21, 27, 28, 29, 30 | Mean of constituent item scores | ((x – 1) / 3)) * 100 | Higher score reflects better performance |
Positive behaviour | 5 | 1 - 3 | 31,32,33,34,35 | Mean of constituent item scores | ((x – 1) / 2)) * 100 | Higher score reflects better performance |
Negative behaviour | 2 | 1 - 3 | 36,37 | Mean of constituent item scores | ((x – 1) / 2)) * 100 | Lower score reflects better performance |