It looks like the typo has been fixed in the explanation to read ‘due to the sensitivity of the PASS’. The reason we are positive she will be independent based on sensitivity and not specificity, even though specificity is higher is because of what they are testing. Specificity is for ruling out conditions whereas sensitivity is for ruling in. If the specificity is high and the test says something is NOT going to happen, then we are confident it is a true negative and we trust the outcome WON’T happen. If the sensitivity is high and the test says something IS going to happen, then we are confident that is it a true positive and we trust the outcome WILL happen. The results of her score puts her in the range of being independent so we are looking to see if we can trust that it will happen, aka is this a true positive, which is sensitivity. If the score was in the range that she would not be ambulatory, then the high specificity would be the best indicator to determine if she would or would not be ambulatory, because we are trying to determine if it is a true negative result. In that scenario, a high specificity would give us high confidence that she would not be independently ambulatory upon discharge based on her PASS score.
