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. 2003 Jul 21;2003(3):CD004110. doi: 10.1002/14651858.CD004110

Robertson 1999.

Methods Randomised Controlled Trial
Participants 24 participants aged 1;09 ‐ 2;06
 Participants are described as coming from white middle‐class households
 12 males and 9 females finished the programme
Interventions Clinician administered intervention for expressive vocabulary and syntax. Child centred approach to provide general stimulation. Therapy administered for 150 minutes a week for 12 weeks
 12 children received clinician intervention
 12 children received delayed intervention
Outcomes Language Sample: MLU, total number of words
 Parent report of vocabulary (CDI) 
 Outcomes excluded: Stress and behaviour measures, % of intelligible utterances
Notes This study was also an unpublished Phd thesis.
 Children could have receptive difficulties but only two did. Most only had expressive difficulties below 10%tile on vocabulary measure of CDI
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment (selection bias) Unclear risk B ‐ Unclear