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Table 1 Purposive sampling matrix of parents and children

From: MOMENT – Management of Otitis Media with Effusion in Cleft Palate: protocol for a systematic review of the literature and identification of a core outcome set using a Delphi survey

Child age (years) Treatment Total
  Ventilation tubes Hearing aids Ventilation tubes and hearing aids Watchful waiting  
Parent sampling matrix     
 0 to 5 3 3 2 2 10
 6 to 8 3 3 2 2 10
 9 to 11 3 3 2 2 10
 Total 9 9 6 6 30
Child sampling matrix
 6 to 8 3 3 2 2 10
 9 to 11 3 3 2 2 10
 Total 6 6 4 4 20