Table 3.

Association of Overall Visual Ability With Patient Characteristics: Analysis of Variance^a

Variable	Sum of Squares	df	Mean Square	F Ratio	P Value
Ageb	9.582	3	3.194	3.051	.03
Sex	0.107	1	0.107	0.1	.75
logMAR visual acuityc	8.78	3	2.927	2.908	.04
Logarithm of contrast sensitivityd	1.148	2	0.574	0.542	.58
Depressed	0.033	1	0.033	0.031	.86
Geriatric Depression Scalee	0.646	3	0.215	0.201	.90
No. of symptomatic comorbidities	6.944	9	0.772	0.723	.69
SF-36 physical componentf	1.477	3	0.492	0.464	.71
Telephone Interview for Cognitive Statusg	2.382	3	0.794	0.744	.53
Support services needed (eg, none or family)	0.716	1	0.716	0.702	.40
Living alone	1.666	1	1.666	1.571	.21
Driving status	0.016	1	0.016	0.015	.90

Abbreviation: SF-36, Medical Outcomes Study 36-Item Short Form Health Survey.

^aIncorporating a correction for multiple comparisons, we found that P < .004 is statistically significant for a criterion of α < .05.

^bAge in years is categorized into 66 years of age or younger, from older than 66 years of age to 76 years of age or younger, from 76 years of age to 84 years of age or younger, and older than 84 years.

^cVisual acuity is categorized into mild, moderate, severe, and profound vision loss.

^dContrast sensitivity is defined as log contrast sensitivity categorized into normal (0.8–1.6) and abnormal (<0.8).

^eDepression is defined as a Geriatric Depression Scale continuous variable made categorical into quartiles.

^fPhysical is defined as an SF-36 physical component continuous variable made categorical into quartiles.

^gCognition is defined as a Telephone Interview for Cognitive Status continuous variable made categorical into quartiles.