Most of this is noise; the survey provides data, but discipline is needed not to see a direct causality.
The fact that 75% of respondents verify their documents weeks in advance is an observation, not an unshakable proof of a link.
There are always uncontrollable factors that can alter declared behaviors, such as an unexpected strike at the airport forcing last-minute verification.
The most reasonable posture is to consider this as an intention, subject to real-world uncertainties.