Table 1 Characteristics of Patients at Initial Visit* (2004–2015) ( n  = 3994)

Age (years)

31.1 (7.6)

Race/Ethnicity

 Black/African American

57.9

 Hispanic/Latino

5.0

 White

15.1

 Other

4.8

 Declined to Answer

17.2

Educational Attainment

 Some high school or less

37.2

 Grad high school/GED

32.7

 Some College/Voc/Tech

15.0

 Grad college/postgrad

12.7

 Declined/Unavailable

2.4

Marital Status

 Married

24.8

 Not Married

75.2

Smoking Status

 Current Smoker

19.3

 Former Smoker

7.2

 Never Smoker

73.5

Mean BMI (kg/m²)^a

30.0 (9.8)

Mean PM_2.5 (µg/m³)^b

10.0 (1.4)