Table 5.

Best performing models for Hammond Pond (Newton, MA), Blue Hills (Milton, MA), and Hall's Pond (Brookline, MA), using only COVID-19 data, with measurements taken when trees were non-leafed as the reference category.

Site	R2	Explanatory variables	Coefficients	SE	t-Value	p value	Significance
Hammond Pond	0.66	Intercept	67.41	0.68	90.58	<0.001	***
		log(road distance)	−9.56	0.33	−29.11	<0.001	***
		COVID-19 with leafed trees	−1.43	0.44	3.25	0.0012	**
Blue Hills	0.48	Intercept	81.95	1.47	55.08	<0.001	***
		log(road distance)	−12.37	0.62	−19.98	<0.001	***
		COVID-19 with leafed trees	−1.26	0.64	1.98	0.049	*
Hall's Pond	0.10	Intercept	46.36	0.33	145.68	<0.001	***
		COVID-19 with leafed trees	1.51	0.46	−3.25	0.002	**