Table 2. Oxygenation and Apnea Times, End-tidal Oxygen Concentration, and Atelectasis in Patients Given 100%, 80%, or 60% Oxygen

Data are presented as mean ± SD (and range).

*Includes 1 min of preoxygenation.

†P < 0.01 comparing the three groups regarding apnea time, and the amount of atelectasis at the basal scan immediately after apnea (Kruskal–Wallis test).

^‡Missing value due to technical reasons.

ETo²= end-tidal oxygen concentration; Fio²= fractional inspired oxygen tension.