A comparison of two-coloured filter systems for treating visual reading difficulties

Figures & data

Table 1. Summary statistics*.

	DRT (n = 37)		Harris (n = 36)
	Mean	SD	Mean	SD	Significance
Matrices (t score)	45.3	11.01	48.7	9.92	ns
Similarities (t)	44.6	11.29	47.0	9.22	ns
Recall of digits (t)	43.6	9.10	45.2	7.32	ns
Reading (s) score baseline	80.5	10.16	84.2	8.17	ns
Spelling (s) score Baseline	82.6	9.14	84.8	8.47	ns
Irregular words (s per correct)	20.8	23.09	19.9	23.08	ns
Non–words (s per correct)	17.7	16.59	12.3	8.10	ns
Age (months)	117	9.52	109	12.57	p < 0.01

*t scores have a mean of 50 and a standard deviation of 10; s scores have a mean of 100 and a standard deviation of 15.

Figure 1. Increase in reading and spelling BAS II “s” scores after 3 months use of DRT or Harris filters.

Figure 2. Change in non-word and irregular word reading time (s).