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 3 Summary of practitioner feedback-based factor refinement of each survey

Survey	Number of factors	Level of factors	Vignette population
Infant	8	3x2x2x3x2x2x3x3	1296
Adolescent	9	3x2x2x2x2x3x2x3x3	2592

ISSN: 1471-2288