and illicit drug use were assessed in Part II, the Part II sample is considered in this report. Part II cases were weighted by the inverse of their probability of selection in order to adjust for differential sampling. There was also poststratification adjustment to bring the sample distributions into balance with population sociodemographic and geographic distributions [6]. The complexity of these adjustments differed across countries depending on the amount of population data available for poststratification. More details about sampling and weighting procedures are discussed elsewhere [27].
