FAI was developed in two different forms:
- for parents with one children suffering from a chronic disease or ill children who has siblings younger than 3 years old - FAI-O (only child);
- for parents with at least two children, the brother/sister of the ill child has 3 years or more- FAS-S (siblings) The two forms are identical, with the exception that FAI-S has an additional dimension with respect to FAI-O, that specifically regards the involvement of siblings in the illness path of the sick brother/sister.
Development of FAI followed several steps:
- definition of initial instrument dimensions
- item wording for each dimension
- definition of scoring
- focus group with parents of patients suffering from a chronic disease to evaluate item content and linguistic clarity
Validation of FAI for each form (FAI-O and FAI-S):
Validation consists in several steps, identical for the two versions but in different in timing, depending on the number of admnistration.
- first phase: the FAI is administered to parents of patients with different chronic disease (each form needs to reach the total of 300 administrations).
- second phase: statistical analysis aimed to obtain the final version of each FAI form (define actual dimensions and most adequate items)
- third phase: administration to a new sample of parents of children suffering from a chronic disease (each form needs to reach the total of 150 administrations).
- fourth phase: statistical analysis aimed to confirm the adequacy of the instrument