Table 2. Atelectatic Volumes

Data are presented as median, first (25%) quartile, and third (75%) quartile.

Significant difference (Mann–Whitney U test)

between *ZEEP and CPAP,

between †CPAP and ARS,

between ‡ZEEP and ARS. All P < 0.05.

ARS = alveolar recruitment strategy group; CPAP = continuous positive end-expiratory group; ZEEP = zero end-expiratory pressure group.