Table 1.
Baseline characteristics of participants from 2001 to 2004 National Health and Nutrition Examination Survey (NHANES), divided by oxidative balance score tertiles.
| 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) | |
Data are presented as percentages for categorical variables and means ± SD for continuous variables.
ED erectile dysfunction, CVD cardiovascular diseases, OBS oxidative balance score, CKD chronic kidney diseases.