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Table 2 The mean, standard deviation and the Cohen’s d effect size of the subscales of the main five domains of the SNOT-22 questionnaire over the study period

From: Pattern of symptom improvement following endoscopic sinus surgery for chronic rhinosinusitis

SNOT-22 (Five main domains) SNOT-22 domains’ scores over time Difference in the score means between preoperative and average of 6 months post ESS
Preoperative 1-week post ESS 1-month post ESS Average of 6 months post ESS Significance of the differeNce Raw mean difference d Magnitude
M SD Mdn M SD Mdn M SD Mdn M SD Mdn t df P    
Rhinologic symptoms (0–30) 18.66 3.78 19.5 12.47 5.16 12.5 11.56 8.03 13.5 9.12 8.15 9.00 7.22 67 < 0.001 − 9.54 1.12 Large
Extra nasal rhino logic symptoms (0–15) 6.99 2.00 7 6.01 2.13 6 3.69 1.46 3.5 4.80 3.44 3.75 4.87 67 < 0.001 − 2.19 0.59 Moderate
Ear/facial symptoms (0–25) 9.09 2.77 9 5.62 3.85 4.5 6.52 6.02 6.5 4.79 5.79 2 6.34 67 < 0.001 − 4.29 0.77 Moderate
Psychological dysfunction (0–35) 6.41 6.43 4.5 3.46 4.39 2 7.75 8.66 4.5 4.24 6.52 0 1.99 67 0.049 − 2.18 0.24 Mild
Sleep dysfunction (0–25) 7.61 4.17 7 3.96 3.70 3 6.31 7.01 3.5 3.62 5.00 0 5.58 67 < 0.001 3.99 0.68 Moderate
SNOT-22 (0–110) 40.30 12.34 39 26 14.20 23 30.88 24.36 29.5 22.18 20.76 17.5 6.75 67 < 0.001 18.12 0.82 Large
  1. (M) mean, (Mdn) median, (d) Standardized mean difference, (t) t test value, (p) p value significant results set at < 0.05, (df) degree of freedom