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 1 Initial IV (factors) population based on refinement of factor generation from literature and interviews

Survey	Number of factors	Levels of factors	Vignette population
Infant (6–24 months)	10	3x2x3x4x4x2x2x2x4x3	27,648
Child and Adolescent (8–16 years)	11	4x2x3x4x4x3x2x2x2x4x3	110,592
Adolescent (13–17 years)	11	3x2x3x4x4x3x2x2x2x4x3	82,944

ISSN: 1471-2288