Table 1 Comparison between a population survey and a microenvironmental measurement campaign.
Population survey | Microenvironmental measurement study | |
|---|---|---|
Unit of observation | Individual | microenvironment* |
Requirement for the study sample | representative for the population of interest | representative in terms of exposure-relevant behaviours for the population of interest |
Selection of participants | random and representative sample needed | convenient sample is sufficient oversampling of rare exposure-relevant behaviours |
Motivation of participants | part of the random sample will not be motivated | convenient sample is more motivated on average |
diary | basic and simple, if any at all | compulsory |
Measurement duration | as long as reasonable for the participants | not crucial |
Sample size | many individuals | many measurements from numerous microenvironments of the same type |