The two quasi‐randomised trials used randomisation but did not report the method for generating the random sequence and were judged as having unclear risk of selection bias. The RCT was judged at low risk for selection bias. None of the included studies examined the effects of NSOMTs on any other primary outcomes, such as speech intelligibility, speech physiology and adverse effects, or on any of the secondary outcomes such as listener acceptability. One study reported a change in postintervention articulation test results but used an inappropriate statistical test and did not report the results clearly. Two studies did not find NSOMT as adjunctive treatment to be more effective than conventional speech intervention alone, as both intervention and control groups made similar improvements in articulation after receiving treatments. Of the two quasi‐randomised controlled trials, one included 10 children (six boys and four girls), aged five years eight months to six years nine months, with speech sound disorders as a result of tongue thrust, and the other study included eight children (four boys and four girls), aged three to six years, with moderate to severe articulation disorder only.
Z VIBE AUSTRALIA TRIAL
One study, a randomised controlled trial (RCT), included four boys aged seven years one month to nine years six months ‐ all had speech sound disorders, and two had additional conditions (one was diagnosed as "communication impaired" and the other as "multiply disabled"). This review identified three studies (from four reports) involving a total of 22 children that investigated the efficacy of NSOMT as adjunctive treatment to conventional speech intervention versus conventional speech intervention for children with speech sound disorders.
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