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Table 4 Poisson regression with understory diversity (species richness) as the dependent variable and environmental variables included as independent variables. n = 39, p value ≤.05 level of significance

From: Effects of vegetation structure and human impact on understory honey plant richness: implications for pollinator visitation

Variables B Wald χ 2 p value
Canopy density −1.033 50.267 <.000
Horizontal heterogeneity of canopy surface height 0.188 38.785 <.000
Slope gradient −0.404 1.568 .211
Distance from a road 0.001 8.302 .004