Factors affecting branch failures in open-grown trees during a snowstorm in Massachusetts, USA

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Table 2 Explanatory variables in logistic regressions that were significant (p < 0.01) or marginally significant (p < 0.05) with respect to probability of failure for each species

Species	Effect	Logit	z	p(>\|z\|)
Red maple	Defect	−1.58 (0.43)	−3.65	<0.001
	No Defect*DBH	0.15 (0.05)	3.15	0.002
Green ash	DBH	0.30 (0.10)	2.88	0.004
	No Defect*DBH	0.26 (0.12)	2.22	0.026
Honeylocust	DBH	0.04 (0.02)	2.11	0.035
Red pine	DBH	0.21 (0.09)	2.25	0.024
White pine	DBH	0.09 (0.02)	4.17	<0.001
London planetree	DBH	0.05 (0.02)	2.18	0.029
Pin oak	DBH	0.07 (0.02)	4.45	<0.001
	Defect	−1.34 (0.61)	−2.21	0.027
Red oak	Defect	−2.33 (0.67)	−3.47	0.001
Littleleaf linden	Defect	−2.11 (0.84)	−2.50	0.013
	Leaf	1.97 (0.74)	2.65	0.008
Liberty elm	No Defect*DBH	0.27 (0.14)	1.97	0.049

Logit of the odds ratio for each effect are followed by the standard error in parentheses.
‘*’ Indicates an interaction between two main effects.