Answer :

who all had the surgery, how many people the surgery helped, an how many the surgery did not help.

The conclusion about the effectiveness of preventive surgeries can be drawn by gathering the data from the people who experience the surgery. The data would need the observations of the patients that had the surgery.

What are preventive surgeries?

Preventive surgeries are those surgeries in which the tissues or organs or glands are removed from the body, even if they show no signs of cancer.

Preventive surgeries are done to prevent the development of cancer in the future. These surgeries are done on people who have a high risk of developing cancer.

Thus, data gathered from those who have undergone preventive surgery can be used to derive conclusions about their efficacy. The observations made by the surgical patients would be necessary for the data.

Learn more about preventive surgeries, here:

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