TABLE 5.

Cox proportional hazards analysis—Stratified by acute versus progressive decline

Progressive decline
Variable	Coefficient	SE	Hazard ratio	CI	Z	P ‐value
Animals—raw	−0.11	0.02	0.90	(0.86–0.94)	−4.47	< 0.0001
Letter F—raw	0.01	0.03	1.01	(0.96–1.06)	0.44	0.66
Animals—speed	−0.37	0.08	0.69	(0.59–0.8)	−4.68	< 0.0001
Letter F—speed	−0.22	0.09	0.80	(0.67–0.97)	−2.33	0.02
Age	0.04	0.01	1.04	(1.01–1.07)	2.81	0.005
Sex (M)	−0.54	0.22	0.58	(0.38–0.89)	−2.50	0.01
Some college	0.16	0.33	1.17	(0.62–2.24)	0.49	0.62
College+	0.03	0.34	1.03	(0.53–1.99)	0.08	0.4
HS graduate	−0.40	0.34	0.67	(0.34–1.31)	−1.17	0.24
Race (W)	0.28	0.23	1.33	(0.85–2.06)	1.25	0.21
Region (BELT)	0.18	0.23	1.20	(0.77–1.88)	0.80	0.42
Region (BUCKLE)	0.06	0.27	1.06	(0.63–1.79)	0.21	0.83

Acute decline
Animals—raw	−0.04	0.01	0.96	(0.94–0.98)	−4.15	< 0.0001
Letter F—raw	0.00	0.01	1.00	(0.98–1.02)	−0.34	0.74
Animals ‐ speed	−0.16	0.03	0.85	(0.8–0.91)	−4.71	< 0.0001
Letter F—speed	−0.07	0.05	0.93	(0.85–1.02)	−1.56	0.12
Age	0.00	0.01	1.00	(0.99–1.01)	0.53	0.60
Sex (M)	0.04	0.09	1.04	(0.87–1.24)	0.46	0.64
Some college	0.21	0.16	1.23	(0.9–1.69)	1.30	0.19
College+	0.13	0.16	1.13	(0.82–1.56)	0.77	0.44
HS graduate	0.16	0.16	1.17	(0.87–1.59)	1.03	0.30
Race (W)	−0.04	0.10	0.97	(0.8–1.17)	−0.36	0.72
Region (BELT)	−0.16	0.10	0.86	(0.7–1.04)	−1.53	0.13
Region (BUCKLE)	−0.07	0.12	0.93	(0.74–1.17)	−0.60	0.55

Abbreviations: CI, 95% confidence interval of hazard ratio; HS, high school; M, male; SE, standard error; W, White.

Notes: Concordance of progressive model = 0.743. Concordance of acute model = 0.593.