Table 1 Demographic data for participant groups

Mean age, in years (+ SD)

17.7 (+ 5.2)

18.1 (+ 3.1)

15.5 (+ 1.6)

15.7 (+ 2.3)

18.6 (+ 3.9)^*

< .001

Age range, in years

12–35

15–27

12–18

12–20

12–28

Percent female (N)

56.0% (28 F)

27.1% (13 F)

44.9% (22 F)

16.7% (4 F)^**

52.9% (54 F)

< .001

Mean parental education, in years (+ SD)

15 (1.30)

12 (1.53)^***

16 (1.28)

16 (1.1)

15 (1.66)

< .001

Race/ethnicity

< .001

 White, Hispanic

18%

24%

41.4%^***

26.7%

14.7%

 White, non-Hispanic

74%^***

43%

41.7%

46.6%

27.5%

 Other

8%

33%

16.9%

26.7%

57.8%^***