Table 1.

Demographic characteristics at baseline visit of participants enrolled in the SMART study at the first visit (n = 118)

Age
At first visit, mean ± SD, years	34.5±15.1
Younger than 18 years	19 (16.1%)
18–29 years	29 (24.6%)
30–39 years	32 (27.1%)
40–49 years	18 (15.3%)
50–59 years	12 (10.1%)
Older than 60 years	8 (6.8%)
Gender
Female	62 (53%)
Male	56 (47%)
Race
White/Middle Eastern	98 (83%)
Black	11 (9%)
Asian/Indian	6 (5%)
Other/multiracial	1 (1%)
Unknown	2 (2%)
Latino
Yes	3 (2.5%)
No	114 (96.6%)
Could not be determined	1 (0.9%)
Smoking historya
Never smoker	85 (72.6%)
Former smoker	20 (17.1%)
Current smoker	12 (10.3%)
Vitamin A supplementationa
Yes	15 (12.8%)
No	102 (87.2%)

^aInformation missing for 1 participant.