Table 3.

Equivalency findings for visual enhancement performance.

	Baseline	6-week	6-month	Difference (SE)	Upper confidence limit	Clinical critical difference	Clinical equivalence?
Phonemes in AB words
Control	52.71	56.32	56.77	3.61 (2.52)	8.03	13.0	Yes
Train + PS	57.09	56.93	58.48	−0.16 (3.12)	5.33	13.0	Yes
Train only	55.41	57.83	55.76	2.42 (4.26)	9.83	13.0	Yes
AB words
Control	40.18	41.26	43.47	1.08 (3.02)	6.37	18.0	Yes
Train + PS	43.65	42.81	44.86	−0.84 (3.50)	5.29	18.0	Yes
Train only	42.32	45.65	43.46	3.33 (3.98)	10.24	18.0	Yes
Words in CUNY sentences
Control	35.64	29.69	41.39	−5.95 (8.52)	8.99	9.8	Yes
Train + PS	41.17	35.54	48.28	−5.63 (9.42)	10.88	9.6	No
Train only	48.67	52.20	45.05	3.59 (4.47)	11.30	9.7	No

Note. Columns display the mean baseline (preclass) performance, the mean 6-week evaluation (postclass) performance, the mean 6-month performance, the mean difference between the baseline and 6-week performance (with the standard error in parentheses), the upper level of the confidence interval measured around the difference score, and the upper level of the confidence interval that must be exceeded in order to demonstrate a true clinical improvement. If the measured upper level of the confidence limit was less than the required clinical critical difference, this indicates that there was no clinically significant change in performance, and this is indicated by a “yes” in the rightmost column.