Table 1 Patient demographics

Age, mean (SD), y

48.03 (10.21)

46.98 (10.44)

49.46 (9.94)

49.43 (9.72)

0.67

Gender, % female

91.10

89.45

89.80

94.78

0.25

Race of participants^a

- American Indian

5 (1.3)

4 (1.8)

0 (0.0)

1 (0.9)

0.60

- Alaska Native

1 (0.3)

1 (0.5)

0 (0.0)

0 (0.0)

- Asian

3 (0.8)

1 (0.5)

1 (2.0)

1 (0.9)

- Native Hawaiian/other Pacific Islander

1 (0.3)

1 (0.5)

0 (0.0)

0 (0.0)

- Black/African-American

7 (1.8)

6 (2.8)

1 (2.0)

0 (0.0)

- White

353 (92.4)

200 (91.7)

45 (91.8)

108 (93.9)

- Other

12 (3.1)

5 (2.3)

2 (4.1)

5 (4.4)

Ethnicity

0.17

- Hispanic or Latino

19 (5.0)

8 (3.7)

5 (10.2)

6 (5.2)

- Not Hispanic or Latino

360 (94.2)

209 (95.9)

43 (87.8)

108 (93.9)

- No answer

3 (0.8)

1 (0.5)

1 (2.0)

1 (0.9)

Participants Reside in the United States

343 (89.8)

197 (90.4)

43 (87.8)

103 (89.6)

0.85

Participants not from US

39 (10.2)

21 (9.6)

6 (12.2)

12 (10.4)

- Full time

145 (38.0)

89 (40.8)

14 (28.6)

42 (36.5)

0.09

- Part time

40 (10.5)

18 (8.3)

9 (18.4)

13 (11.3)

- Retired

25 (6.5)

10 (4.6)

2 (4.1)

13 (11.3)

- Homemaker

37 (9.7)

18 (8.3)

4 (8.2)

15 (13.0)

- Student

12 (3.1)

8 (3.7)

1 (2.0)

3 (2.6)

- Disabled

123 (32.2)

75 (34.4)

19 (38.8)

29 (25.2)

- Medicare

52 (13.6)

29 (13.3)

7 (14.3)

16 (13.9)

0.54

- Medicare advantage

18 (4.7)

10 (4.6)

3 (6.1)

5 (4.4)

- Medicaid

28 (7.3)

18 (8.3)

0 (0.0)

10 (8.7)

- Tri-care/Military

5 (1.3)

5 (2.3)

0 (0.0)

0 (0.0)

- Commercial/Private

227 (59.4)

134 (61.5)

27 (55.1)

66 (57.4)

- Other/type

54 (14.1)

24 (11.0)

9 (18.4)

21 (18.3)

- None

34 (8.9)

20 (9.2)

6 (12.2)

8 (7.0)

Monthly co-payment (n)

N/A

 $0

47 (21.6)

2 (4.1)

15 (13.0)

<0.0001

  > $0–25

65 (29.8)

24 (49.0)

68 (59.1)

 $25–$40

13 (6.0)

5 (10.2)

16 (13.9)

 $40–80

23 (10.6)

0 (0.0)

6 (5.2)

 $80–100

7 (3.2)

0 (0.0)

0 (0.0)

  > $100

35 (16.1)

1 (2.1)

0 (0.0)

 Don’t know

0 (0.0)

3 (6.1)

10 (8.7)

 Missing

0 (0.0)

14 (28.6)

0 (0.0)