A Prevalence Study of Hearing Loss among Primary School Children in the South East of Iran

Table 2

Frequency distribution of types of tympanogram based on school grade.

Tympanogram	Grade
	6		7		8		9		10		Total
	Fr.	Percent	Fr.	Percent	Fr.	Percent	Fr.	Percent	Fr.	Percent	Fr.	Percent
A	243	81%	266	88.7%	267	89%	275	91.7%	275	91.7%	1326	88.4%
B	12	4%	10	3.3%	6	2%	6	2%	6	2.3%	41	2.7%
C	45	15%	24	8%	27	9%	19	6.3%	18	6%	133	8.9%
Total	300	100%	300	100%	300	100%	300	100%	300	100%	1500	100%

∗Fr.: frequency.