Table 2.

The mean difference m in the hearing threshold t between the series calculated on the basis of n data points collected on a group of N subjects, its standard deviation σ, Pearson’s correlation coefficient r and linear estimators a, b of Deming’s regression y=ax+b and corresponding confidence intervals CI at P=.05 for the hearing threshold below 40dBHL as well as greater than or equal to 40dBHL.

Group		n	m	σ	r (CI)	a (CI)	b (CI)
Series 1 vs 2, N=51
	t<40dBHL	498	−1.45	7.37	.74 (0.70, 0.78)	0.84 (0.84, 0.84)	1.24 (1.19, 1.30)
	t≥40dBHL	105	−1.99	9.88	.64 (0.51, 0.74)	1.07 (1.04, 1.09)	−5.67 (−7.04, −4.30)
Series 1 vs 3, N=37
	t<40dBHL	339	−1.52	9.72	.58 (0.51, 0.65)	1.11 (1.10, 1.12)	−3.38 (−3.53, −3.22)
	t≥40dBHL	90	−0.64	13.67	.44 (0.25, 0.59)	0.66 (0.62, 0.69)	17.59 (15.56, 19.62)