Please give detailed explanation. Thanks

A study was conducted to determine key predictors of chromosomal fetal abnormalities. Using the multiple logistic regression model and a cut off selected by the investigator, 87 fetuses were predicted by the model of having an abnormality. However, only 26 of the 87 that were predicted to have the abnormality actually did. Of the 116 fetuses that the model predicted did not have the abnormality, 9 of them actually did. Construct a 2 by 2 table of these results to help you calculate the sensitivity of the model using this cutoff. What is the sensitivity