However, there was significantly
greater gain for the treated targets than the
untreated targets between tests 1 and 2 (t(18) = 3.29,
p = 0.004) and between tests 2 and 3 (t(18) = 4.01,
p = 0.001). Thus, experimental group performance
on untreated grammatical goals did not change over
the three test times. Furthermore, whereas change in
the treated and untreated goals did not differ in the
pre-intervention period, the treated targets improved
significantly more than the untreated targets over the
intervention period. This suggests that the treatment effect
was specific to the grammatical goals targeted in the
intervention programme.