Table 1 The weighted demographic characters of the study sample stratified by biological sex, NHANES 2005 to 2014

Proportion (95% Confidence interval)

Proportion (95% Confidence interval)

Proportion (95% Confidence interval)

Depressive symptoms ^a

 < 0.001 ^f

No

92.0% (91.3–92.6)

94.4% (93.6–95.1)

89.6% (88.6–90.5)

Yes

8.0% (7.4–8.7)

5.6% (4.9–6.4)

10.4% (9.5–11.4)

Sexual Minority status ^b

 < 0.001 ^f

Heterosexual

94.1% (93.5–94.8)

95.2% (94.2–96.1)

93.1% (92.3–93.8)

Sexual minorities

5.9% (5.2–6.5)

4.8% (3.9–5.8)

6.9% (6.2–7.7)

Sexual Orientation

 < 0.001 ^f

Heterosexual

94.2% (93.5–94.8)

95.2% (94.2–96.1)

93.1% (92.3–93.8)

Gay/lesbian

1.9% (1.5–2.4)

2.5% (1.8–3.5)

1.2% (0.9–1.7)

Bisexual

2.8% (2.4–3.1)

1.4% (1.1–1.8)

4.1% (3.6–4.7)

Not sure

0.8% (0.6–1.0)

0.5% (0.3–0.7)

1.1% (0.9–1.4)

Others

0.4% (0.3–5.8)

0.3% (0.2–0.6)

0.5% (0.03–0.07)

Age ^c

0.3 ^f

 < 40

48.9% (47.4–50.4)

49.5% (47.7–51.2)

48.4% (46.6–50.2)

 >  = 40

51.1% (50.0–52.6)

50.5% (48.8–52.3)

51.3% (49.8–53.4)

Race

 < 0.001 ^f

 White

68.0% (64.9–71.0)

68.1% (65.1–71.0)

67.9% (64.5–71.1)

 Black

11.2% (9.6–12.8)

10.2% (8.9–11.7)

12.1% (10.3–14.1)

 Hispanic

5.3% (4.3–6.5)

5.2% (4.2–6.5)

5.3% (4.3–6.5)

 Other ^d

15.6% (13.9–17.5)

16.5% (14.6–18.5)

14.7% (13.0–16.6)

Education

 < 0.001 ^f

 B.A. and above

30.3% (28.2–32.6)

28.7% (26.5–31.0)

32.0% (30.0–34.5)

 A.A. and some college

33.2% (32.0–34.3)

31.3% (30.0–32.7)

35.0% (33.5–36.5)

 High school

22.0% (20.6–23.4)

24.1% (22.5–25.8)

19.8% (18.4–21.4)

 Did not complete high school

14.5% (13.2–15.9)

15.9% (14.4–17.5)

13.2% (11.9–14.7)

Income ^e

 < 0.01 ^f

 High

37.9% (35.6–40.2)

38.8% (36.5–41.1)

37.0% (34.6–39.4)

 Middle

28.4% (27.0–30.0)

28.4% (26.8–30.1)

28.5% (26.9–30.1)

 Low

18.6% (17.5–19.8)

18.5% (17.3–19.9)

18.6% (17.5–19.9)

 Poverty

15.1% (13.7–16.5)

14.2% (12.8–15.8)

15.9% (14.4–17.5)

Smoking status

 < 0.001 ^f

 Non-smokers

55.8% (54.2–57.5)

51.5% (49.6–53.5)

60.1% (58.1–62.0)

 Former smokers

19.7% (18.6–20.7)

21.7% (20.4–23.0)

17.7% (16.2–19.2)

 Current smokers

24.5% (23.1–26.0)

26.8% (25.1–28.5)

22.2% (20.7–23.9)

BMI

 < 0.001 ^f

 Underweight

1.6% (1.3–1.9)

1.0% (0.7–1.3)

22.5% (18.6–27.1)

 Normal

30.1% (28.8–31.5)

26.2% (24.7–27.7)

34.1% (32.4–35.8)

 Overweight

32.3% (31.2–33.4)

38.3% (37.0–39.6)

26.3% (24.8–27.9)

 Obese

36.0% (34.7–37.3)

34.6% (32.9–36.3)

37.4% (35.9–38.9)

Mean WBC (1000 cells/ul)

 < 0.001 ^g

 Mean (95% confidence interval)

7.3 (7.2–7.4)

7.2 (7.1–7.3)

7.4 (7.3–7.5)

Year

0.8 ^f

 2005–2006

20.4% (18.1–22.9)

20.2% (18.0–22.5)

20.6% (18.0–23.4)

 2007–2008

19.7% (17.4–22.3)

19.5% (17.4–21.8)

19.9% (17.3–22.8)

 2009–2010

19.2% (17.3–21.2)

19.4% (17.5–21.5)

18.9% (16.8–21.1)

 2011–2012

19.9% (17.8–22.3)

20.0% (17.7–22.6)

19.8% (17.6–22.3)

 2013–2014

20.8% (18.8–23.1)

20.8% (18.6–23.2)

20.8% (18.8–23.1)