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Number of hospitalized patients and mean cost relating to patients who underwent bariatric surgery, according to three-month periods (quarter-year, Q), one year before and one year after surgery. Q −1 refers to the first three-month period immediately before surgery; Q −2 refers to the second trimester before the surgery and so on. Q +1, +2 and so on refer to the successive three-month periods after the surgery). US$ = United States dollars; SD = standard deviation.
