Figure 1 | Scientific Reports

Figure 1

From: Noninvasive ventilation with a helmet in patients with acute respiratory failure caused by chest trauma: a randomized controlled trial

Figure 1

Flow chart of inclusion participants. At the planned time of interim analysis, and the patients included were 29 in helmet group versus 30 in face mask group with P = 0.004, which met the early termination criterion (P < 0.005) and introduced the sample size in helmet group is an odd number and face mask group is an even number.

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