Interviewers introduced these questions on firearms by stating, "The next questions are about your current or previous exposure to loud sounds or noises." Interviewers asked, "How many TOTAL rounds have you ever fired?" The survey form directed interviewers to read categories if necessary and to include target shooting, hunting and occupational experiences (military service, etc.). Further, the survey form advised that, "One round equals one shot."

The codes changed between 2007 and 2023 and values were reported in categories as follows:

• 1 to less than 100 rounds

• 100 to less than 1000 rounds

• 1000 to less than 10,000 rounds

• 2023: 10,000 rounds or more

• 2007: 10,000 to less than 50,000 rounds

• 2007: 50,000 rounds or more

The first digit identifies categories which can be identified in all years. The second digit identifies periods specified for only a subgroup of years.