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Sinus fluid fill-volume (SFFV) of guinea pigs with increasing intranasal ragweed pollen (RWP) administration. SFFV decreased maximally to an average of ~25%, indicating an increase in sinus congestion of nearly 75%. Values are means ± SE. *P < 0.05 compared with control (0, no RWP); vP < 0.05 compared with next lowest RWP treatment group; n = 4 guinea pigs/bar.
