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The change in PNIF before and after decongestion with xylometazoline compared to level of subjective nasal obstruction. Blue dots and line = OSA group. Green dots and line = controls. Delta PNIF = the absolute difference in PNIF at baseline and after decongestion (l/min). There is a significant positive correlation between VAS nasal obstruction and delta PNIF only in the control group.
