Table 4: Statistical analysis of preoperative and postoperative middle ear pressure.

Statistical analysis of preoperative and postoperative middle ear pressure
Middle ear pressure (dapa) Preop no. of ears Preop Range(dapa) Mean ± std deviation Postop no. of ears Postop Range (dapa) Mean ± std. deviation
< -150 9 -156 to -210 -201.77 ± -35.130 4 -160 to -230 -187.5 ± -25.860
0 to -150 5 -90 to -144 -109.75 ± -28.52 18 -5 to -150 -69.61 ± 46.69
0 to +150 4 35-112 91 ± 28.52 14 50 to 110 93.285 ± 15.42
> 150 22 195-268 226.59 ± 30.34 4 198-210 202 ± 4.690