Regional estimates of duration of risk behaviour for IDU by the method of calculation
| Region | Duration of risk behaviour | ||
|---|---|---|---|
| First method of calculation: based on time from beginning of drug injection until cessation | Second method of calculation: based on percentage of IDU who started drug injection in the last year | Third method of calculation: based on the median/mean time spent in drug injection up to the moment of the study* | |
| Africa | NA | 5.6 (1) | 5.6 (1) |
| Asia | NA | 8.7 (6) | 8.8–13.6 (17) |
| Oceania | 17.0 (1)† | 5.2 (1) | 16.0–18.2 (13) |
| North America | 9.5 (1)† | 4.7 (5) | 8.8–14.0 (33) |
| Europe | 13.9 (1)† | 8.9 (4) | 17.2 (32) |
| South America | NA | NA | 19.6–21.0 (9) |
The number of datasets used for each calculation are given in parenthesis.
*Considering the median equals mean (primarily the median and in its absence the mean).
†Best estimate for the population.
NA, not available.