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Comparison of peak pressure gradient (PPG) directions change: (A) two recline angles (10° and 30°) in response to three tilt angles (15°, 25°, and 35°), (B) three tilt angles (15°, 25°, and 35°) in response to two recline angles (10° and 30°). *A significant difference (p<.05). **A significant difference (p<.005).
