Table 1.

Age frequency of patients in each group

Age (years)	Type of breathing				Total
	Nasal		Mouth
	no	%	no	%
6 — 7	4	13.3	7	23.3	11
7 — 8	13	43.3	12	40.0	25
8 — 9	8	26.6	8	26.6	16
9 — 10	5	16.6	3	10.0	8
Total	30	100.0	30	100.0	60