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Estimates for each region can vary considerably.

Methodology: Systematic review and meta-analysis of studies conducted 2011-2021 (lifetime recall) and 2008-2021 (past year recall).

*The uncertainty for the past year varies from 0.8 to 7.1 percent (95 percent confidence interval).

**The uncertainty for the past year varies from 5.2 to 9.2 percent, for lifetime from 16.6 to 21.5 percent (95 percent confidence interval).

***The uncertainty for lifetime varies from 1.6 to 2.3 percent (95 percent confidence interval).

****The uncertainty for the past year varies from 4.6 to 7.1 percent, for lifetime from 9.8 to 12.3 percent (95 percent confidence interval).

The uncertainty for the past year varies from 2.9 to 7.3 percent, for lifetime from 1.9 to 14.6 percent (95 percent confidence interval).