TABLE 3.

MLR models of E. coli, Enterococcus spp., and PMMoV concentration and PMMoV metagenome relative abundance^a

Model (unit)	r2	Model significance	Independent parameter	Coefficient	95% confidence interval		Significance	Constant
					Lower bound	Upper bound
E. coli (MPN/100 ml)
1	0.406	0	Green	−0.028	−0.037	−0.02	<0.0001	3.445
2	0.552	0	Green	−0.027	−0.035	−0.019	<0.0001	3.124
			Agriculture	0.032	0.017	0.046	<0.0001
3	0.758	0	Green	−0.017	−0.023	−0.01	<0.0001	2.029
			Agriculture	0.039	0.028	0.049	<0.0001
			ACE	0.002	0.002	0.003	<0.0001
Enterococcus spp. (MPN/100 ml)
1	0.37	0	ACE	0.002	0.002	0.003	<0.0001	1.096
2	0.63	0	ACE	0.002	0.002	0.003	<0.0001	−0.282
			EC	0.004	0.003	0.006	<0.0001
3	0.69	0	ACE	0.002	0.001	0.003	<0.0001	10.166
			EC	0.004	0.003	0.005	<0.0001
			Temp (°C)	−0.347	−0.551	−0.142	0.001
PMMoV (GC/100 ml)
1	0.65	0	Green	−0.042	−0.05	−0.034	<0.0001	5.273
2	0.68	0	Green	−0.038	−0.047	−0.029	<0.0001	4.848
			ACE	0.001	0	0.002	0.03
3	0.72	0	Green	−0.038	−0.046	−0.029	<0.0001	4.759
			ACE	0.002	0.001	0.003	0.001
			ACT	−6.87E−05	0	0	0.005
4	0.74	0	Green	−0.039	−0.047	−0.031	<0.0001	5.055
			ACE	0.002	0.001	0.003	<0.0001
			ACT	−5.91E−05	0	0	0.014
			Antecedent dry period (days)	−0.099	−0.186	−0.012	0.027
PMMoV_contig1 (relative abundance)
1	0.641	0	ACE	0.001	0.001	0.001	<0.0001	0.035
2	0.733	0	ACE	0.001	0	0.001	0.001	−0.129
			Residential	0.009	0.001	0.017	0.038
3	0.809	0	ACE	0.001	0	0.001	<0.0001	−0.083
			Residential	0.013	0.005	0.021	0.004
			Antecedent dry period (days)	−0.041	−0.079	−0.004	0.033
PMMoV_reads mapped to reference genome
1	0.558	0	Green	−0.027	−0.036	−0.018	<0.0001	−4.774
2	0.617	0	Green	−0.025	−0.034	−0.016	<0.0001	−8.832
			pH	0.529	0.004	1.054	0.048

^aDependent variables of the MLR models have been log₁₀ transformed; the best-fit model under each category is highlighted in bold.