Characteristics of four questions used to identify severe disability
| Question | Sensitivity | Specificity | PPV | NPV |
|---|---|---|---|---|
| Motor | ||||
| Can the child not walk five steps alone without holding on to anyone or anything? | 83.6% | 98.9% | 91.1% | 97.8% |
| Developmental/cognitive | ||||
| Overall do you think the child is behaving in the same way as a child who is less than 1 year old? | 61.7% | 99.8% | 97.4% | 95.1% |
| Vision | ||||
| Would you say the child sees very little or not at all? | 13.1% | 100.0% | 100.0% | 89.4% |
| Hearing | ||||
| Would you say the child has severe hearing difficulty, or has some difficulty with hearing and has been fitted with hearing aids? | 18.2% | 99.8% | 90.9% | 90.8% |
PPV, positive predictive value; NPV, negative predictive value.