The Prevalence of Tonsilloliths and Other Soft Tissue Calcifications in Patients Attending Oral and Maxillofacial Radiology Clinic of the University of Iowa

Table 5

Frequency distribution of the number of episodes of tonsilitis per year for the matched pair case-control study.

Number of episodes; of tonsillitis per year	Frequency (𝑁)	Percent (%)
	Subjects in case group (𝑁=10)
1	4	40
2	1	10
6	1	10
Not applicable	4	40
	Subjects in control group (𝑁=10)
1	2	20
Not applicable	8	80