3.3. Mean Length of Longest Utterances – MLU-L
Fig. 3 shows the distribution of the 127 children in terms of their MLU-L (SL and SpL groups combined). Of the profoundly
deaf children, 57.5% (N = 23) had a MLU-L score equal to zero, indicating that those children were in a pre-linguistic stage of
language development. Of the severely deaf group, 65% (N = 13) were at the pre-linguistic stage; 30% had an MLU-L above 1
and below 5.4 and one (5%) had an MLU-L above 8.5. Fifty percent of the hearing children had an MLU-L equal to 8.5 or above.
An independent t-test showed that children using SpL, regardless of hearing status, have a MLU-L significantly higher
than those using SL (Table 7).
3.4. Style and efficacy of communication between parent and child
3.4.1. Style of communication between parent and child
A x2 showed that parents of deaf children used a significantly wider range of communication strategies than parents of
hearing children, in a significantly different way (Critical value = 8.84 (Table 8)). They used sign, speech and pointing at the
same time, as well as gentle or firm touch in order to get their children’s attention before initiating communication.
3.3. Mean Length of Longest Utterances – MLU-LFig. 3 shows the distribution of the 127 children in terms of their MLU-L (SL and SpL groups combined). Of the profoundlydeaf children, 57.5% (N = 23) had a MLU-L score equal to zero, indicating that those children were in a pre-linguistic stage oflanguage development. Of the severely deaf group, 65% (N = 13) were at the pre-linguistic stage; 30% had an MLU-L above 1and below 5.4 and one (5%) had an MLU-L above 8.5. Fifty percent of the hearing children had an MLU-L equal to 8.5 or above.An independent t-test showed that children using SpL, regardless of hearing status, have a MLU-L significantly higherthan those using SL (Table 7).3.4. Style and efficacy of communication between parent and child3.4.1. Style of communication between parent and childA x2 showed that parents of deaf children used a significantly wider range of communication strategies than parents ofhearing children, in a significantly different way (Critical value = 8.84 (Table 8)). They used sign, speech and pointing at thesame time, as well as gentle or firm touch in order to get their children’s attention before initiating communication.
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