My intuition tells me that here we are mixing apples and oranges when linking vacation planning and identity document verification.
These are two very distinct dynamics: one related to the anticipatory pleasure of vacations, the other to administrative compliance to avoid disaster.
The survey on planning habits does not capture the fear of being stuck at the airport due to an expired passport, this feeling of urgency is completely absent.
For this link to hold, the survey would need to ask specific questions about past experiences of boarding refusals or anxiety related to papers, as if asking whether people have ever had a problem with their DNI at customs.