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Intervention for Dyslexia - The British Dyslexia Association

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Table 6 (continued). Summary of results of UK intervention studies using structured systematic phonological teaching programmes<br />

Programme Reference Year<br />

Group(s)<br />

THRASS Brooks (2007)<br />

p.233<br />

Ns Taught by<br />

Reading Accuracy Reading<br />

Comprehension<br />

Spelling<br />

Effect size Ratio gain Effect size Ratio gain Effect size Ratio gain<br />

Y2–5 84 Teachers/Teaching<br />

assistants 2.3<br />

Toe by Toe MacKay (2006) Y7 91 Teachers/Teaching<br />

assistants 2.3<br />

Toe by Toe Brooks (2007)<br />

p.236<br />

Number of<br />

studies<br />

Primary 21 Teachers/Teaching<br />

assistants 2.7<br />

11 20 2 12 6 15<br />

Total Ns 2435 745 1635 94 867 1635 1513<br />

Simple<br />

average<br />

Weighted<br />

average<br />

76.09<br />

0.56 4.44 0.91 4.13 0.59 2.75<br />

0.48 3.22 0.92 4.33 0.54 2.58<br />

<strong>Intervention</strong> <strong>for</strong> <strong>Dyslexia</strong> 69

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