Table 1.
Baseline characteristics of participants according to the OBS quartiles.
| Overall | OBS quartiles | P value | ||||
|---|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | |||
| Age, years | 59.06(0.27) | 59.78(0.46) | 59.78(0.54) | 58.91(0.45) | 58.03(0.47) | 0.015 |
| Sex, n (%) | 0.647 | |||||
| Female | 3012(49.93) | 788(47.98) | 723(51.24) | 821(50.44) | 680(50.04) | |
| Male | 3107(50.07) | 981(52.02) | 695(48.76) | 780(49.56) | 651(49.96) | |
| Race, n (%) | <0.001 | |||||
| Mexican American | 1198(8.44) | 311(7.50) | 287(8.83) | 322(8.97) | 278(8.39) | |
| Non-Hispanic Black | 1522(13.89) | 591(21.24) | 361(15.77) | 335(11.38) | 235(8.69) | |
| Non-Hispanic White | 2452(66.20) | 645(60.40) | 541(64.54) | 668(66.64) | 598(72.08) | |
| Other Hispanic | 526(5.13) | 133(5.80) | 132(4.84) | 151(5.72) | 110(4.16) | |
| Other race | 421(6.34) | 89(5.06) | 97(6.02) | 125(7.29) | 110(6.69) | |
| PIR | 2.82(0.04) | 2.31(0.06) | 2.63(0.06) | 2.96(0.06) | 3.26(0.07) | <0.001 |
| Marital status, n (%) | 0.003 | |||||
| Separated | 1901(26.42) | 585(30.28) | 460(26.46) | 498(27.36) | 358(22.07) | |
| Married | 3696(65.19) | 1016(59.57) | 846(65.43) | 960(64.70) | 874(70.34) | |
| Never married | 522(8.39) | 168(10.15) | 112(8.11) | 143(7.93) | 99(7.59) | |
| Education level, n (%) | <0.001 | |||||
| Below high school | 1049(8.59) | 393(13.52) | 274(9.92) | 248(7.61) | 134(4.31) | |
| High school | 2514(39.38) | 816(48.01) | 592(41.60) | 610(36.47) | 496(33.21) | |
| Above high school | 2556(52.03) | 560(38.47) | 552(48.48) | 743(55.92) | 701(62.47) | |
| Drinking status, n (%) | <0.001 | |||||
| No | 2840(39.15) | 923(46.22) | 683(42.27) | 700(35.85) | 534(33.99) | |
| Moderate | 2539(48.36) | 627(40.94) | 566(44.42) | 712(50.77) | 634(55.39) | |
| Heavy | 740(12.50) | 219(12.84) | 169(13.30) | 189(13.38) | 163(10.62) | |
| BMI, kg/m2 | 33.20(0.15) | 33.38(0.27) | 33.10(0.25) | 33.17(0.30) | 33.14(0.30) | 0.880 |
| CRP | 0.61(0.03) | 0.74(0.06) | 0.60(0.04) | 0.56(0.03) | 0.54(0.05) | 0.050 |
| Smoking status, n (%) | <0.001 | |||||
| Former | 2133(35.42) | 616(33.22) | 505(37.07) | 569(35.44) | 443(35.97) | |
| Never | 2990(48.27) | 743(39.76) | 684(46.80) | 808(50.07) | 755(54.90) | |
| Now | 996(16.30) | 410(27.01) | 229(16.13) | 224(14.49) | 133(9.13) | |
| Hypertension, n (%) | 0.017 | |||||
| No | 1695(29.25) | 432(25.61) | 381(27.40) | 459(30.36) | 423(32.72) | |
| Yes | 4424(70.75) | 1337(74.39) | 1037(72.60) | 1142(69.64) | 908(67.28) | |
| CVD | <0.001 | |||||
| No | 4534(75.91) | 1188(68.01) | 1062(75.91) | 1219(78.24) | 1065(80.28) | |
| Yes | 1585(24.08) | 582(31.99) | 355(24.09) | 382(21.76) | 266(19.72) | |
| ACM, n (%) | <0.001 | |||||
| No | 4329(78.76) | 1107(69.60) | 1004(78.90) | 1169(80.06) | 1049(85.17) | |
| Yes | 1790(21.24) | 662(30.40) | 414(21.10) | 432(19.94) | 282(14.83) | |
| CVM, n (%) | <0.001 | |||||
| No | 5611(93.76) | 1570(90.68) | 1301(93.86) | 1476(93.82) | 1264(96.27) | |
| Yes | 508(6.24) | 199(9.32) | 117(6.14) | 125(6.18) | 67(3.73) | |
OBS, oxidative balance score; CVM, cardiovascular mortality; ACM, all-cause mortality; PIR, poverty income ratio; BMI, body mass index; CRP, C-reactive protein; CVD, cardiovascular disease.
OBS quartiles: Q1 ≤ 13, 13< Q2 ≤ 18, 18 < Q3 ≤ 24, and Q4 > 24.
All values are expressed as a weighted proportion (%) or mean ± standard error.