Table 1 Baseline characteristics of participants from 2001 to 2004 National Health and Nutrition Examination Survey (NHANES), divided by oxidative balance score tertiles.

From: The relationship between oxidative balance score and erectile dysfunction in the U.S. male adult population

Variables

Oxidative balance score by tertiles

P value

Overall

Low [3, 20]

High (20, 36]

Number of participants

3318

1739

1579

 

OBS (mean (SD))

19.97 (7.24)

14.10 (3.95)

26.42 (3.66)

 < 0.001

ED (%)

 < 0.001

 No

2438 (73.48)

1200 (69.01)

1238 (78.40)

 

 Yes

880 (26.52)

539 (30.99)

341 (21.60)

 

Age (%)

 < 0.001

 [20, 40)

1130 (34.06)

516 (29.67)

614 (38.89)

 

 [40, 60)

1128 (34.00)

598 (34.39)

530 (33.57)

 

 [60, )

1060 (31.95)

625 (35.94)

435 (27.55)

 

Race (%)

 < 0.001

 Mexican American

690 (20.80)

358 (20.59)

332 (21.03)

 

 Non-Hispanic Black

584 (17.60)

390 (22.43)

194 (12.29)

 

 Non-Hispanic White

1822 (54.91)

870 (50.03)

952 (60.29)

 

 Other Hispanic

119 ( 3.59)

66 ( 3.80)

53 ( 3.36)

 

 Others

103 ( 3.10)

55 ( 3.16)

48 ( 3.04)

 

Poverty income ratio (%)

 < 0.001

  ≤ 1.3

777 (23.42)

478 (27.49)

299 (18.94)

 

 1.4–3.5

1293 (38.97)

699 (40.20)

594 (37.62)

 

  > 3.5

1248 (37.61)

562 (32.32)

686 (43.45)

 

Education (%)

 < 0.001

 High school or less

1720 (51.84)

996 (57.27)

724 (45.85)

 

 Some college

881 (26.55)

459 (26.39)

422 (26.73)

 

 College graduate or higher

717 (21.61)

284 (16.33)

433 (27.42)

 

Marital status (%)

0.013

 Married/living with partner

2326 (70.10)

1193 (68.60)

1133 (71.75)

 

 Never married

554 (16.70)

288 (16.56)

266 (16.85)

 

 Widowed/divorced/separated

438 (13.20)

258 (14.84)

180 (11.40)

 

Hypertension (%)

 < 0.001

 No

2006 (60.46)

960 (55.20)

1046 (66.24)

 

 Yes

1312 (39.54)

779 (44.80)

533 (33.76)

 

Diabetes (%)

 < 0.001

 No

2859 (86.17)

1461 (84.01)

1398 (88.54)

 

 Yes

459 (13.83)

278 (15.99)

181 (11.46)

 

CVD (%)

0.003

 No

2893 (87.19)

1487 (85.51)

1406 (89.04)

 

 Yes

425 (12.81)

252 (14.49)

173 (10.96)

 

Hypercholesterolemia (%)

0.008

 No

2370 (71.43)

1207 (69.41)

1163 (73.65)

 

 Yes

948 (28.57)

532 (30.59)

416 (26.35)

 

CKD (%)

 < 0.001

 Yes

282 ( 8.50)

185 (10.64)

97 ( 6.14)

 

 No

3036 (91.50)

1554 (89.36)

1482 (93.86)

 
  1. Data are presented as percentages for categorical variables and means ± SD for continuous variables.
  2. ED erectile dysfunction, CVD cardiovascular diseases, OBS oxidative balance score, CKD chronic kidney diseases.
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