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document
A randomized controlled trial of nonlinear frequency compression versus conventional processing in hearing aids : speech and language of children at three years of age . OBJECTIVE To determine the effect of nonlinear frequency compression ( NLFC ) on children 's development of speech and language at three years of age . DESIGN A randomized controlled trial was conducted as part of the population-based longitudinal study on outcomes of children with hearing impairment ( LOCHI ) . Participants were randomly assigned to fitting with NLFC ( Phonak Naida V SP or UP ) or with conventional processing in hearing aids , prescribed by using either the NAL or the DSL formula . Standardized tests of speech production , receptive and expressive language were administered , and parent ratings were collected . All assessments were double-blinded . STUDY SAMPLE Participants were 44 of the 450 children in the LOCHI cohort . RESULTS Compared to children using conventional processing , receptive and expressive language was higher but receptive vocabulary and consonant articulation scores were lower for children who use NLFC . There was increased substitution of affricates by fricatives for children using NLFC , compared to children using conventional amplification . After allowing for the effect of multiple demographic variables , the difference in global language scores between groups was not significant ( effect : 0.8 [ 95 % confidence interval : - 6.7 , 8.3 ] ) . CONCLUSIONS There is insufficient evidence to indicate a difference in language ability between children using NLFC and those using conventional amplification .
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Intervention_Physical
nonlinear frequency compression
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Intervention_Physical
conventional processing in hearing aids
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Intervention_Physical
nonlinear frequency compression ( NLFC )
63100
Intervention_Physical
NLFC ( Phonak Naida V SP or UP )
63101
Intervention_Physical
conventional processing in hearing aids
63102
Intervention_Physical
NAL
63103
Intervention_Physical
DSL
63104
Intervention_Physical
conventional processing
63105
Intervention_Physical
NLFC
63106
Intervention_Physical
NLFC
63107
Intervention_Physical
conventional amplification
63108
Intervention_Physical
NLFC
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Intervention_Physical
conventional amplification
63110
Outcome_Mental
speech production , receptive and expressive language
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Outcome_Mental
receptive and expressive language
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Outcome_Mental
receptive vocabulary and consonant articulation scores
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Outcome_Mental
substitution of affricates by fricatives
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Outcome_Mental
global language scores
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Outcome_Mental
language ability
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Participant_Condition
children at three years of age .