Table 2. Mean Treatment Change between Baseline and End-of-Treatment Loudness Judgments for Each Group as a Function of Contour Loudness Category for Each Measurement Frequency.

Group 1
Contour Loudness Category	Frequency (Hz)
	500	2000	4000
1	−0.06	2.61	3.35	1.97
2	0.06	3.69	3.92	2.56
3	3.01	3.69	4.38	3.69
4	5.57	5.06	5.68	5.44
5	7.84	6.99	7.33	7.39
6	9.60	8.81	8.92	9.11
7	11.65	10.00	9.89	10.51
∑Δ	37.67	40.85	43.47	40.66†
Group 2
Contour Loudness Category	Frequency (Hz)
	500	2000	4000
1	−0.63	−0.21	0.61	−0.07
2	−2.29	−0.69	0.13	−0.95
3	−2.15	−1.39	0.29	−1.08
4	−1.88	−0.76	0.64	−0.67
5	0.14	0.00	0.42	0.19
6	1.39	0.69	0.99	1.02
7	1.32	0.90	1.75	1.32
∑Δ	−4.10	−1.46	4.82	−0.25†
Group 3
Contour Loudness Category	Frequency (Hz)
	500	2000	4000
1	1.69	1.44	1.25	1.46
2	3.00	1.69	1.67	2.12
3	3.38	2.00	1.88	2.42
4	3.81	3.25	1.88	2.98
5	4.75	3.88	3.89	4.17
6	6.31	3.81	3.89	4.67
7	6.44	4.31	4.65	5.13
∑Δ	29.38	20.38	19.10	22.95†
Group 4
Contour Loudness Category	Frequency (Hz)
	500	2000	4000
1	1.15	3.65	0.52	1.77
2	−0.52	2.19	1.25	0.97
3	−0.52	1.98	−0.31	0.38
4	0.63	2.40	1.46	1.49
5	0.42	2.81	0.83	1.35
6	1.46	3.33	1.77	2.19
7	0.83	3.75	1.46	2.01
∑Δ	3.44	20.10	6.98	10.17†

Corresponding grand mean change values, averaged across measurement frequency for each loudness category.

^†The summation of the mean change values across category for each frequency and the overall grand mean change value.