Influence of individual tree characteristics, spatial structure and logging history on tree-related microhabitat occurrence in North American hardwood forests

Forest Ecosystems

Table 4 Results of the Poisson regression analyzing the number of TreM classes per living tree. n: number of observations, df: degrees of freedom, χ²: chi-square, AIC: Akaike information criterion, Std.Err: standard error, “^”: significance at p < 0.001, “^”: significance at p < 0.01, “^”: significance at p < 0.05

n	df	χ²	AIC	p	Variables	Estimate	Std.Err	z-value	Pr(<\|z\|)
365	4	85.64	699.12	< 0.001	Intercept	−2.503	0.254	−9.838	< 0.001^***
					DBH	0.04	0.004	9.026	< 0.001^***
					Tree vigor (senescent)	0.757	0.174	4.345	< 0.001^***
					TreM-trees aggregation	0.177	0.065	2.709	0.006^**