Because asking a group of people how often they sunbathe is a horrible way to measure sun exposure. Dishonest answers, imperfect memory, differing definitions o

Because asking a group of people how often they sunbathe is a horrible way to measure sun exposure. Dishonest answers, imperfect memory, differing definitions of sunbathing, and the idea itself that sunbathing and tanning is a proxy for overall sun exposure when they likely don't even make up a significant fraction of a person's UV exposure. Bad, bad, bad.