Table 1.

Eustachian tube parameters for all participants during the Frenzel maneuver Eustachian tube opening pressure (ETOP, in mbar), Eustachian tube opening duration (ETOD, in seconds), and Eustachian tube opening frequency (ETOF, in openings per minute) for all 22 ears mean values ± standard deviation are given with 95% confidence intervals and median

ID	ETOP			ETOD			ETOF
	Mean ± std	95% CI	Median	Mean ± std	95% CI	Median	Median
1	38.3 ± 29.7	21.2–55.5	31.8	4.9 ± 3.3	2.9–6.8	4.6	3
2	31.2 ± 76.6	−8.2–70.6	12	3.3 ± 1.1	2.7–3.9	3.1	4.25
3	69.6 ± 17.3	57.2–82.0	64	3.2 ± 0.9	2.5–3.8	3.0	2.5
4	183.0 ± 23.8	145.2–220.8	184	2.5 ± 0.8	1.2–3.9	2.3	1
5	9.0 ± 6.7	6.3–11.7	8	1.4 ± 1.0	1.0–1.8	0.9	6.5
6	58.4 ± 35.9	32.7–84.1	47.5	2.3 ± 0.7	1.7–2.8	2.5	2.5
7	10.1 ± 5.7	8.3–12.0	12	1.8 ± 0.7	1.5–2.0	1.8	9.75
8	21.2 ± 6.0	18.8–23.7	20.5	2.4 ± 0.6	2.2–2.7	2.3	6.5
9	27.0 ± 10.6	21.7–32.3	27	3.1 ± 1.0	2.6–3.6	3.2	4.5
10	8.9 ± 2.5	8.4–9.5	9	0.6 ± 0.2	0.6–0.6	0.6	17.5
11	20.8 ± 6.0	18.4–23.2	22	2.7 ± 1.1	2.3–3.1	2.7	6.8
Total	22.7 ± 33.7	18.6–26.8	13	2.0 ± 1.6	1.8–2.2	1.8	4.5