First, context: Here, in Spain, saying that 75% of people "check their papers in advance" in a survey is one thing, but the reality of the cita previa is another.
You can have the best intentions in the world to plan weeks ahead of a trip, but the local administrative regime often dictates the pace.
For example, you want to renew your passport, but the first appointment available at the police station is in two months, and that completely changes your planning.
The survey captures what people want to do, not always what they can do in this specific market.