The inversion of logic is necessary here: a survey of 11 questions on planning habits cannot explain directly why people verify their identity documents so far in advance.
It is the concrete experience of administrative delays that shapes this behavior, not a survey.
In Italy, obtaining or renewing a document can take months, multiple appointments, and an unforeseen marca da bollo.
The contrarian in me asserts that the fear of missing a flight due to an expired passport is a motivation much more powerful and tangible than any “planning habit” from a 78 responses survey.