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Table 2 Spearman’s correlation matrix demonstrating relationships between the variables use value (UV), number of individuals (NI), average purchase value (Purchase), and average sale value (Sale) of birds. The values in bold represent the correlation coefficient for each set of variables, and the other values represent the p value of the correlation

From: Illegal trade of songbirds: an analysis of the activity in an area of northeast Brazil

 UVNIPurchaseSale
UV 0.0010.0280.002
NI0.90 0.0430.002
Purchase0.380.35 0.001
Sale0.520.520.60