This survey with 78 responses is a start, but it does not give us proof of the real causes of anxiety.
We must decide not to confuse correlation and causality.
These people who check their papers at the last minute may already have financial or health issues that are the real source of stress, regardless of when the passport is taken out of the drawer.
To understand, we need to set a clear step: ask questions about personal finances and unforeseen events to know why people procrastinate, instead of just observing procrastination.