Figure 3.

Relationships between pressure support levels and duration of the various phases of inspiration. The phases (phase 1 [closed circles], phase 2 [open circles] and phase 3 [closed triangles]) are defined in the text. Data are expressed as mean ± standard error of the mean. **P < 0.01, ***P < 0.001, versus pressure support = 5 cmH₂O. °P < 0.05, versus pressure support = 10 cmH₂O.