Table 4. Success rates of Otovent (A), sphere 1 (D), and sphere 2 (E) in causing a Valsalva manoeuvre when inflated (n = 12).

Balloons		Success rate
n	Mean (%)	95% confidence interval (%)
Otovent (A)	12	66.7	40.0 to 93.3
Sphere 1 (D)	12	58.3	30.4 to 86.2
Sphere 2 (E)	12	66.7	40.0 to 93.3