Table 1.

PaO₂ changes from different groups (mean±SD, mmHg)

Groups (n=6)	T0 baseline	T2 at the end of MV	T4 2 hours after MV	T6 4 hours after MV
Control	113.50 ± 7.15	115.50 ± 8.87	114.00 ± 7.62	112.50 ± 8.69
MSC	113.00 ± 11.08	113.33 ± 11.09	111.67 ± 12.48	112.00 ± 10.79
VT20	119.50 ± 12.08	57.00 ± 4.43*	58.33 ± 4.84*	57.00 ± 5.18*
MSC+ VT20	119.00 ± 16.05	108.00 ± 24.75†	104.67 ± 24.52	104.83 ± 25.69
VT20+ MSC	120.17 ± 10.85	83.17 ± 23.17	83.67 ± 19.05	80.33 ± 16.12*

SD: Standard deviation; MV: Mechanical ventilation; MSC: Mesenchymal stem cell; VT: Tidal volume. *P < 0.05 versus control group; ^†P < 0.05 versus VT20 group.