Table 3.

Negative Binomial Regression of Count of Errors on Cognitive Function, ACL (2001/2002) Age 55+ (N = 779)

	Model 1		Model 2		Model 3		Model 4		Model 5
	IRR	(95% CI)	IRR	(95% CI)	IRR	(95% CI)	IRR	(95% CI)	IRR	(95% CI)
PM_2.5	1.05 *	(1.01,1.10)	1.05 *	(1.01,1.10)	1.04 +	(1.00,1.08)	1.03	(0.98,1.07)	1.03	(0.99,1.07)
High Neighborhood Stress			1.20	(0.84,1.72)	0.90	(0.65,1.25)	0.86	(0.61,1.21)	0.86	(0.62,1.19)
PM_2.5*High Neighborhood Stress							1.09 *	(1.01,1.18)	1.09 *	(1.00,1.18)
Age					1.02 ^**	(1.01,1.03)	1.02 ^**	(1.01,1.03)	1.01 +	(1.00,1.03)
Female					0.95	(0.73,1.23)	0.97	(0.75,1.26)	0.97	(0.74,1.27)
Black					1.67 ^***	(1.29,2.16)	1.68 ^***	(1.30,2.17)	1.66 ^***	(1.27,2.17)
Education
College (ref)					1.00		1.00		1.00
High School					1.61 ^**	(1.16,2.23)	1.60 ^**	(1.15,2.21)	1.60 ^**	(1.15,2.21)
Less than High School					2.14 ^***	(1.49,3.08)	2.14 ^***	(1.49,3.08)	2.19 ^***	(1.54,3.11)
Household Income < $35,000					1.39 *	(1.02,1.88)	1.40 *	(1.03,1.90)	1.38 *	(1.01,1.87)
Not Currently Married					1.00	(0.75,1.32)	1.01	(0.76,1.34)	1.03	(0.78,1.36)
Employment Status
Employed (ref)					1.00		1.00		1.00
Unemployed					1.34	(0.92,1.96)	1.33	(0.91,1.93)	1.33	(0.91,1.94)
Retired					1.35	(0.94,1.92)	1.33	(0.93,1.90)	1.32	(0.92,1.90)
Length of Residence					0.99 +	(0.99,1.00)	0.99 +	(0.99,1.00)	0.99	(0.99,1.00)
Neighborhood Socioeconomic Context
Disadvantage					0.93	(0.80,1.08)	0.92	(0.79,1.06)	0.95	(0.82,1.09)
Affluence					0.80 *	(0.66,0.96)	0.80 *	(0.67,0.96)	0.79 *	(0.66,0.95)
Constant	0.52 ^***	(0.45,0.59)	0.51 ^***	(0.44,0.58)	0.06 ^***	(0.02,0.15)	0.06 ^***	(0.02,0.14)	0.09 ^***	(0.03,0.28)

α (over dispersion parameter)	0.46		0.45		0.03		0.02		0.01
Log Likelihood	−611.31		−610.81		−554.41		−552.94		−548.92
Likelihood Ratio Test χ²	5.71*		6.73*		159.14^***		172.91^***		190.71^***

^***

p<.001;

^**

p<.01;

p<.05;

^†

p<.10;

PM_2.5= fine particulate matter