The Efficacy of Intranasal Insulin in the Treatment of Post-Viral Persistent Olfactory Dysfunction: A Systematic Review.

In contrast, although the change in olfactory discrimination scores in the insulin group (SMD, –4.10; 95% CI, –8.31 to 0.10; I2=95.6%) exceeded that of the sham group, the difference did not reach statistical significance ( Fig. 3B ).

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