580 Dorothy V.M. Bishop et al. Figure 1 Grand average auditory ERPs for tones (upper panel) and syllables (lower panel) from typically developing control (continuous) and SLI (dashed) groups at nine electrode sites. that Levene’s test of equality of variances was not vio- lated at any electrode. The SLI group obtained signiﬁ- cantly lower ICCs for tone stimuli at electrodes F4 (t = 1.87, p = .032), C4 (t = 2.81, p = .003) and T4 (t = 2.86, p = .003). Analysis of mean amplitude over 100–228 ms To check whether the same pattern of results would be obtained if one considered mean amplitudes rather than ICCs, an ANOVA was conducted on the factors group, © 2007 The Authors. Journal compilation © 2007 Blackwell Publishing Ltd.