Figure 2

Mean changes in functional residual capacity (FRC) in 35 patients undergoing surgery for ovarian cancer. Solid line represents the group’s mean. FiO₂ = inspired oxygen fraction. Data were missing in 15 patients because of instrumental failure (5 and 3 patients in the 30%- and 80%-group, respectively), inadequate data quality (2 and 3 patients) and 2 patients in the 80%-group refused the postoperative test (Figure 1).