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Table 2 Comparison between pretreatment and post-treatment VAS for olfactory parosmia in both groups

From: The potential therapeutic effect of platelet-rich plasma in the treatment of post-COVID-19 parosmia

Group

Pretreatment VAS

Mean ± SD

Post-treatment VAS

Mean ± SD

Wilcoxon sign rank test

p-value

Case group

(30 patients)

9.13 ± 0.73

3.33 ± 3.29

z =  − 4.3724

p < 0.00001

Control group

(30 patients)

9.27 ± 0.78

7.43 ± 2.84

z =  − 3.0594

0.002

  1. VAS visual analog scale