Who does these studies and what is their method?
And what percentage of the people are going to tell a stranger how many guns they have?
It was published in "Social Psychiatry and Psychiatric Epidemiology".
Method: take a representative sample of adults in the United States, 3500 people, from a group who previously agreed to participate.
Ask them questions.
Use the answers from people who admit they are gun owners to estimate those who you think are likely gun owners, but do not admit it.
Your question: And what percentage of the people are going to tell a stranger how many guns they have? is what they were trying to get a handle on. The number surprised them.