Table 2. Linear regression results (inflation number 2–50) for Otovent (A), sphere 1 (D), and sphere 2 (E).

Balloon	n	Equation	CI intercept	CI gradient	P value of gradient	Predicted number of inflations when maximum pressure is 40 mmHg
Otovent (A)	8	Y=–0.1775*X+86.63	86.23 to 87.02	–0.191 to –0.1641	<0.0001	262
Sphere 1 (D)	10	Y=–0.1108*X+77.13	76.49 to 77.77	–0.1323 to –0.0893	<0.0001	335
Sphere 2 (E)	10	Y=–0.2355*X+88.70	88.05 to 89.34	–0.2574 to –0.2136	<0.0001	206