The surgical techniques used to treat Hastings contracture are identical to those used successfully to treat certain work-related injuries to the hand.

　　 A separate survey found that 90 percent of patients operated on for Hastings contracture report increased hand mobility within one month after the surgery.

　　 All of the patients in the survey were required by their insurance companies to seek a second opinion from a qualified surgeon before undergoing the operation.

　　 Many people who have Hastings contracture choose to tolerate its effects rather than undergo the risks of surgery.

　　13.The most widely used therapy for a certain type of ulcer completely heals such ulcers in 44 percent of patients within six months. In a six-month trial of a new therapy for this type of ulcer. 80 percent of ulcers treated achieved significant healing and 61 percent were completely heated. Since the trial treated only ulcers of this type that were worse than average, the new therapy clearly promotes healing more effectively than the most widely used therapy.

　　The answer to which of the following would be most useful in evaluating the argument given?

　　 What differences are there, if any, in the ways that the two therapies are administered?

　　 Is there any significant difference between the costs associated with the two therapies?

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