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Table 1 Explanatory variables used in the meta-analysis

From: What attributes of extra virgin olive oil are really important for consumers: a meta-analysis of consumers’ stated preferences

Variable Mean value Min Max
WTP (relative variation) 0.46 −0.92 0.98
Olive Origin certification 0.30 0 1
Brand 0.10 0 1
Neutral taste 0.15 0 1
Traceability 0.07 0 1
Organic Certification 0.12 0 1
Peer-reviewed article 0.60 0 1
Italy-based survey 0.30 0 1