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Table 5 Summary of cognitive interview-based factor refinement of each survey

From: Development of a factorial survey for use in an international study examining clinicians’ likelihood to support the decision to initiate invasive long-term ventilation for a child (the TechChild study)

Survey Number of factors Level of factors Vignette population
Infant 7 2x2x2x2x2x3x2 192
Adolescent 8 2x2x2x2x2x2x3x2a 288
  1. a the survey was programmed so that the factor “Adolescent’s own opinion” did not appear in vignettes where the level “Rett Syndrome” appeared for the factor “Diagnosis”. This reduces the vignette population of the adolescent survey from 384 to 288