Table 3.

Health of trees in Lynnfield, MA, correlated with site variables and trunk diameter. Larger values show stronger correlations¹; blanks indicate significance. B or T indicates where a significant correlation with health of branches or trunk was stronger than with foliage (F) or the composite (C) of foliage, branches, and trunk.

Species	No. trees	Planting Space						Curb dist.		Traffic class²		Site class³		Trunk diameter
		Total		Width		Length		Curb dist.		Traffic class²		Site class³		Trunk diameter
		C	F	C	F	C	F	C	F	C	F	C	F	C	F
All species	1495	.14	.11			09	.07	.19	.15	.10	.07			−.41	−.37
							T		BT	B	B			B	B
Norway maple	302	.23	.19	.20	.15	.13	.15	.26	.25					−.27	−.23
				T	T									B	B
Red maple	141							.28		T	T			−.42	−.32
									BT						BT
Silver maple	13
Sugar maple	362	.25	.22	.16	.12			.32	.27					−.41	−.34
			BT	B	BT				B	T	T			B	B
White ash	198							.16	.16	.18
								B	B	B	B
Honeylocust	14							.15	.51					−.61	−.53
									T						T
Crabapple	17												−.58
								BT	BT	B	B		B
London plane	4
White oak	59									.36	.33
										B	B
Pin oak	14						.55
Red oak	−	−	−	−	−	−	−	−	−	−	−	−	−	−	−
Black oak	191					16								−.17
						T	T	T	T					B	B
American elm	76	−27	−.23	−.26
		B	B	B	B

↵1 Spearman correlation coefficients, significance level 0.05.
↵2 Traffic class light = 1, moderate = 2, heavy = 3.
↵3 Site classes light residntial = 1, dense residential = 2, business = 3