Table 5.

Participant Characteristics Associated With Full-Field Stimulus Thresholds (FST) White Stimulus

	N	FST White Stimulus (dB) Mean ± SD	Univariable Analysis P Value	Multivariable Analysis P Value
All	93	−32 ± 13
Clinical diagnosis			<0.001	<0.001
USH2	56	−26 ± 10
ARRP	37	−39 ± 13
Age at enrollment , y			0.61a	NAb
<30 y	20	−33 ± 9
30 to < 40 y	26	−31 ± 12
40 to < 50 y	27	−32 ± 15
≥50 y	20	−30 ± 15
Gender			0.53	0.04
Female	51	−31 ± 12
Male	42	−32 ± 14
Duration of disease, y c			<0.001a	<0.001a
<10	27	−40 ± 11
10 to < 20	33	−33 ± 11
≥20	33	−22 ± 9
Race/ethnicity			0.53	NAb
Non-Hispanic white	84	−32 ± 13
Other	9	−29 ± 10
Smoking status
Ever smoked daily	26	−31 ± 13	0.94	NAb
Never smoked daily	67	−32 ± 13
Dietary supplement use
None	35	−32 ± 12	0.55	NAb
Vitamin A only	8	−33 ± 13
DHA only	5	−24 ± 6
Lutein only	5	−37 ± 9
Multiple supplements	40	−31 ± 15

^aVariable was analyzed as continuous.

^bFactors with P values > 0.05 in the stepwise selection process were not included in the final multivariable model.

^cComputed from age of onset (a participant-reported field based on their awareness of visual symptoms) and date of enrollment.