Table 2.

Result of the simplest model that includes within-county and between-county pollen effects (unadjusted estimation)

	Estimate	SE	95% CI	Z	Pr > |Z|
Intercept	−10.795	0.1846	−11.1569, −10.4331	−58.46	<0.0001
Average tree pollen count	−0.0003	0.0009	−0.0020, 0.0015	−0.31	0.7595
Deviation from average tree pollen count	0.0001	0.0001	−0.0000, 0.0002	1.73	0.0833
Average grass pollen count	0.0210	0.0066	0.0080, 0.0340	3.17	0.0015
Deviation from average grass pollen count	0.0008	0.0008	−0.0007, 0.0023	1.06	0.2879
Average ragweed pollen count	0.0053	0.0025	0.0005, 0.0102	2.15	0.0318
Deviation from average ragweed pollen count	0.0002	0.0004	−0.0005, 0.0009	0.53	0.5977

SE, standard error; CI, confidence interval.