Table 1 Criteria used for bias analysis
Criteria for risk of bias analysis | Low risk of bias | Moderate risk of bias | High risk of bias |
|---|---|---|---|
Study sample size* | Sample equal to the universe Sample randomness of 5% All heads of household interviewed Stabilized accumulation curve | Sample extracted from the universe with error above 5% and < 10% Representation of up to 80% of heads of household No population information, but stable accumulation curve | Sample extracted with > 10% error Representativeness < 80% of heads of household There is no information on the number of households Accumulation curve moves away from stabilization |
Indication of the study area and population | Presents a map of the study area and detailed information on the study population | Not applicable | It does not present a map of the study area and detailed information on the study population |
Species identification strategies | Use of photographs, specimen collection and field observation | Not applicable | Comparison of vernacular/local name with available literature |
Data analysis | Creation of statistical models and quantitative indices | Qualitative analyses and descriptive statistics | Qualitative analyses |
Exposition of food taboos | Clear definition of taboo motivations | Not applicable | Taboo tangential exposure |