Table 1.

Prevalence of sclerotic signs in RT-TE patients and healthy controls with their sensitivity, specificity and predictive values.

	Prevalence, n (%)
Signs of sclerotic process	Patients (n = 62)	Healthy controls (n = 54)	Sensitivity	Specificity	PPVa	NPVb
Tonsillar sclerosis	29 (47)	2 (4)	0.47	0.96	0.94	0.61
Crypts' obstruction	34 (55)	8 (15)	0.55	0.85	0.81	0.62
Scar tissue on tonsils	49 (79)	11 (20)	0.79	0.80	0.82	0.77

RT-TE patient – patients who were referred for tonsillectomy due to recurrent tonsillitis episodes, PPV – positive predictive value, NPV – negative predictive value