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)

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

Survey	Number of factors	Level of factors	Vignette population
Infant	7	2x2x2x2x2x3x2	192
Adolescent	8	2x2x2x2x2x2x3x2^a	288

^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

ISSN: 1471-2288