Table 1 Characteristics of participants by quintiles of superoxide dismutase and malondialdehyde
|  | Superoxide dismutase, U/mL | Malondialdehyde, μmol /L | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Quintile 1, ~ 50.86 | Quintile 2, 50.87~55.53 | Quintile 3, 55.54~59.41 | Quintile 4, 59.42~63.52 | Quintile 5, 63.53~ | Quintile 1, ~ 3.56 | Quintile 2, 3.57~4.39 | Quintile 3, 4.40~5.13 | Quintile 4, 5.14~6.20 | Quintile 5, 6.21~ | |
No. of participants | 445 | 443 | 446 | 445 | 444 | 442 | 446 | 447 | 446 | 442 |
Age, median (IQR), years | 83(73–94) | 84(73–96) | 87(76–97.3) | 88(78–100) | 90(80–100) | 90(79–100) | 87(77–97) | 86(76–96) | 84-(74–96) | 86(74–100) |
Female, n(%) | 204(45.8) | 227(51.2) | 227(50.9) | 267(60.0) | 302(68.0) | 253(57.2) | 235(52.7) | 243(54.4) | 253(56.7) | 242(54.8) |
Residence, n(%) | ||||||||||
 Urban | 124(27.9) | 82(18.5) | 50(11.2) | 60(13.5) | 69(15.5) | 82(18.6) | 103(23.1) | 97(21.7) | 66(14.8) | 37(8.4) |
 Rural | 321(72.1) | 361(81.5) | 396(88.8) | 385(86.5) | 375(84.5) | 360(81.4) | 343(76.9) | 350(78.3) | 380(85.2) | 405(91.6) |
Education time, years | ||||||||||
 0 | 251(57.0) | 243(55.2) | 281(63.4) | 299(68.1) | 322(73.2) | 302(69.1) | 270(61.1) | 257(57.8) | 255(57.6) | 311(71.5) |
 >=1 | 189(43.0) | 197(44.8) | 162(36.6) | 140(31.9) | 118(26.8) | 135(30.9) | 172(38.9) | 188(42.2) | 188(42.4) | 124(28.5) |
Smoking status, n(%) | Â | |||||||||
 Current | 73(17.7) | 87(20.0) | 87(19.8) | 61(13.8) | 54(12.4) | 69(16.2) | 81(19.1) | 71(16.4) | 79(17.9) | 63(14.4) |
 Not current | 340(82.3) | 348(80.0) | 352(80.2) | 382(86.2) | 382(87.6) | 358(83.8) | 344(80.9) | 363(83.6) | 363(82.1) | 375(85.6) |
Alcohol drinking status, n(%) | Â | |||||||||
 Current | 68(16.3) | 83(19.1) | 71(16.2) | 64(14.5) | 40(9.1) | 52(12.1) | 65(15.3) | 74(17.1) | 80(18.1) | 56(12.7) |
 Not current | 349(83.7) | 352(80.9) | 367(83.8) | 377(85.5) | 398(90.9) | 379(87.9) | 359(84.7) | 359(82.9) | 361(81.9) | 384(87.3) |
Frequent vegetable intake, n(%) | 191(46.0) | 199(45.9) | 220(50.5) | 196(44.3) | 180(41.0) | 193(44.8) | 211(49.8) | 214(49.3) | 230(52.8) | 139(31.5) |
Frequent fruit intake, n(%) | 147(35.3) | 175 (40.0) | 135(30.8) | 157 (35.4) | 138 (31.2) | 128 (29.6) | 139 (32.6) | 174 (39.9) | 181 (41.0) | 130 (29.4) |
Frequent meat intake, n(%) | 305 (73.5) | 302(69.1) | 301 (69.0) | 284 (64.0) | 300 (67.9) | 264 (61.1) | 289 (68.2) | 302(69.3) | 285 (64.6) | 353 (80.0) |
Frequent physical activity, n(%) | 55 (13.7) | 75 (17.7) | 68(16.0) | 74(17.1) | 52(12.1) | 60 (14.2) | 67 (16.2) | 70 (16.5) | 74(17.3) | 53 (12.4) |
Restricted ADL, n(%) | 337 (83.2) | 328 (77.2) | 338 (79.9) | 330 (76.7) | 342 (80.1) | 336 (80.0) | 345 (82.5) | 329 (76.7) | 337 (80.6) | 329 (77.4) |
BMI, mean (SD), kg/m2 | 21.9 (4.2) | 21.7 (4.1) | 21.1 (4.1) | 21.0 (4.2) | 20.6 (4.9) | 20.3 (4.3) | 21.27 (4.1) | 21.3 (4.1) | 21.7 (4.9) | 21.7 (4.2) |
Hypertension, n(%) | 166 (40.2) | 193 (45.0) | 207 (48.7) | 201 (46.6) | 165 (39.7) | 190 (44.6) | 178 (42.7) | 177 (42.1) | 188 (43.9) | 198 (46.8) |
Glucose, mean (SD), mmol/l | 234.8 (39.6) | 238.6 (54.8) | 236.1 (36.5) | 237.9 (35.1) | 242.6 (46.6) | 235.7 (40.1) | 238.7 (43.1) | 240.3 (48.3) | 240.1 (47.4) | 235.3 (35.4) |
Total cholesterol, mean (SD), mmol/l | 4.2 (1.0) | 4.3 (1.0) | 4.2 (1.0) | 4.3 (1.0) | 4.4 (1.0) | 4.0 (0.9) | 4.2 (1.0) | 4.3 (1.0) | 4.4 (1.0) | 4.5 (1.0) |
Triglycerides, mean (SD), mmol/l | 1.2(0.9) | 1.0(0.6) | 0.9(0.5) | 1.0(0.6) | 0.9(0.5) | 0.9(0.5) | 0.9(0.6) | 1.0(0.7) | 1.1(0.7) | 1.0(0.7) |