摘要：The aim of this Campbell systematic review is to examine the effectiveness of speech and language interventions for children with primary speech and language delay/disorder. Thirty‐six studies were found, based on a total of 1,500 children involved in thirty‐three randomised controlled trials. This Review concludes, on the basis of the available international studies in this field, that speech and language therapy generally has a positive effect on children with expressive phonological difficulties. The therapy also helps children who have a problem with their active vocabulary, i.e. children who have difficulty in using words they understand. Children, who have difficulty with active vocabulary alone, but no problem understanding and acquiring language, also benefit from speech and language therapy. Speech and language therapy for children who have difficulty in applying grammar and constructing sentences is, however, only thought to have a positive effect if the child does not have other significant receptive speech and language difficulties.
