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| Region | N* | Mean ± SD |
|---|---|---|
| Africa | 43 | 0.67±0.17 |
| Americas | 31 | 0.78±0.07 |
| Eastern Mediterranean | 20 | 0.79±0.09 |
| Europe | 49 | 0.85±0.08 |
| Southeast Asia | 9 | 0.87±0.10 |
| Western Pacific | 21 | 0.86±0.09 |
*N denotes the number of countries in the analysis.
