The number of missed items for the PORPUS was low and virtually identical under both conditions of data collection.
However, the accuracy of self-reported cannabis use depends on appropriate conditions of data collection, including confidentiality and anonymity [ 73].
Although desirable, measurement of absolute counts was not feasible due to the conditions of data collection and the need to transport samples to Prague.
First, the reported difficulties relate to three major areas concerned with quality reporting: Working conditions and practices of data collection, institutional management of the data, and specific attitudes.
Incident reporting on rare but potentially serious events has some parallels to quality reporting, but also differs significantly regarding background working conditions and techniques of data collection.
The questions included into the final version prior to data collection could be assigned a priori to three major subject areas: 1. Topics related to working conditions and practices of data collection; 2. topics related to the knowledge of in-house management of data on anaesthesia quality; 3. topics related to knowledge and to attitudes regarding data collection.
Prevalence indicates the percentage of healthy Chinese men and women with a condition at the time of data collection, and means indicate the average value of a characteristic in healthy Chinese adults.
One reason, Dr. Seyfarth said, was that he and Dr. Cheney studied animals in natural conditions, where the pace of data collection is much slower, whereas Dr. Hauser had moved into studying captive animals.
This might be explained by a poorer diet in Poland as a result of more difficult socio-economic conditions at the time of data collection.
Finally, the data used in this study had been collected in 2002 2005, and the results reflect conditions in these countries at the time of data collection which might be little different from the conditions in these countries now.
