Table 2.

Analysis of hearing results.

	Preoperative average Air-Bone gap (dB)		Post-operative average Air-Bone gap (dB)		Average Air-Bone gap closure (dB)
	Group A (n = 48)	Group B (n = 48)	Group A (n = 48)	Group B (n = 48)	Group A (n = 48)	Group B (n = 48)
500 Hz	36.5	38.5	13.6	16.7	22.9	21.8
1000 Hz	43.9	46.9	17.5	20.5	26.4	26.4
2000 Hz	42.7	45.4	18.7	25.9	24.0	19.5
Mean ± SD	41.0 ± 3.9	43.6 ± 4.4	16.6 ± 2.6	21.0 ± 4.6	24.4 ± 1.7	22.5 ± 3.5
SD	3.971	4.479	2.666	4.623	1.789	3.513
Variation of SD	15.77	20.07	7.112	21.37	3.20	12.34

SD, standard deviation.

Paired t-test: t value is 0.9074; df = 2 with standard error of difference 1.873.

With 95% confidence interval, two tailed p-value is 0.460.

Statistically no significant difference is observed in post operative hearing gain in two groups.