Table 2.

Poisson Regression Model Relating Number of EDs per 100,000 Population With Income, Percentage With Poor Education, and With No Insurance

Variable	Value	Relative Rate (95% CI)	p-value for trend
Income	$20,001–$30,000	1.00	0.003
Income	$30,001–$40,000	0.60 (0.14–2.50)
Income	$40,001–$50,000	0.33 (0.08–1.38)
Income	$50,001–$60,000	0.33 (0.08–1.39)
Income	$60,001–$70,000	0.13 (0.02–0.65)
Income	$70,001–$80,000	0.24 (0.05–1.18)
No insurance	T1: [0–16.3%]	1.00	0.63
No insurance	T2: [16.3%–19.3%]	0.81 (0.52–1.25)
No insurance	T3: >19.3	0.83 (0.46–1.52)
Education < 9 yr	T1: [0–5.2%]	1.00	0.23
Education < 9 yr	T2: [5.2%–10.5%]	0.63 (0.36–1.09)
Education < 9 yr	T3: >10.5%	0.58 (0.30–1.13)

T = tertile.