Table 1. Characteristics of participants.
| Variables | All (n = 1630) | SOD < 58 (IU/mL)
(n = 866) |
SOD > 58 (IU/mL)
(n =764) |
P value |
| Data are presented as n (%) or median (interquartile range) BMI: body mass index; BP: blood pressure; CRP: C-reactive protein; HDLC: high-density lipoprotein cholesterol; HR: heart rate; LDLC: low-density lipoprotein cholesterol; SOD: superoxide dismutase. | ||||
| Age, yrs | 84 (73−95) | 81 (71−92) | 86 (76−99) | < 0.001 |
| Gender, male | 839 (51.4%) | 400 (46.1%) | 439 (57.4%) | < 0.001 |
| Category of residence | ||||
| City and town | 240 (14.8%) | 145 (16.8%) | 95 (12.4%) | 0.014 |
| Rural | 1390 (85.2%) | 721 (83.2%) | 669 (87.5%) | |
| Weight, kg | 50 (41−60) | 53 (44−62) | 48 (40−57) | < 0.001 |
| Heigth, cm | 155 (147−163) | 157 (149−165) | 153 (145−161) | < 0.001 |
| Waist circumference, cm | 80 (73−87) | 81 (74−89) | 78 (71−85) | < 0.001 |
| BMI, kg/cm2 | 21.0 (19.0-24.0) | 21.40 (19.13−24.20) | 21.0 (18.01−23.30) | < 0.001 |
| BMI < 25, normal | 1381 (84.7%) | 709 (81.8%) | 672 (87.9%) | < 0.001 |
| BMI ≥ 25, overweight | 249 (15.3%) | 157 (18.2%) | 92 (12.1%) | |
| Average BP systolic, mmHg | 140 (122−156) | 139 (125−155) | 140 (122−159) | 0.573 |
| Average BP diastolic, mmHg | 80 (72−90) | 82 (75−90) | 79 (70−88) | 0.010 |
| Rhythm of heart, irregular | 155 (9.5%) | 82 (9.4%) | 74 (9.5%) | 0.952 |
| Heart rate | 74 (67−81) | 73 (66−80) | 74 (68−82) | 0.017 |
| Current smoker | 291 (17.8%) | 177 (20.4%) | 114 (14.9%) | 0.004 |
| Current drinker | 295 (18.0%) | 168 (19.4%) | 127 (16.6%) | 0.146 |
| Regular exercise | 285 (17.4%) | 159 (18.3%) | 126 (16.4%) | 0.322 |
| Suffering from disease | ||||
| Hypertension | 445 (27.3%) | 247 (28.5%) | 198 (25.9%) | 0.239 |
| Heart disease | 127 (7.7%) | 66 (7.6%) | 61 (7.9%) | 0.644 |
| Stroke | 122 (7.4%) | 68 (7.7%) | 54 (7.0%) | 0.548 |
| Diabetes | 42 (2.5%) | 28 (3.2%) | 14 (1.8%) | 0.075 |
| Blood and urine biomarker | ||||
| White blood cell count, 109/L | 5.3 (4.4−6.5) | 5.3 (4.4−6.4) | 5.3 (4.4−6.5) | 0.625 |
| Red blood cell count, 1012/L | 4.3 (3.9−5.0) | 4.3 (3.9−5.0) | 4.3 (3.8−5.0) | 0.911 |
| Hemoglobin, g/L | 126.0 (113.0−140.0) | 129.0 (116.8−143.0) | 122.0 (109.0−136.0) | < 0.001 |
| Plasma albumin, g/L | 40.6 (37.5−43.8) | 40.7 (37.9−44.3) | 40.5 (37.7−43.48) | 0.193 |
| hsCRP, mg/L | 0.87 (0.38−2.34) | 0.89 (0.42−2.36) | 0.85 (0.34−2.33) | 0.047 |
| Blood urea nitrogen, mmol/L | 6.57 (5.47−7.87) | 6.46 (5.36−7.62) | 6.66 (5.58−8.10) | 0.001 |
| Plasma creatine, mmol/L | 77 (64−91) | 75 (64−89) | 78 (65−95) | 0.004 |
| Total cholesterol, mmol/L | 4.26 (3.64−4.92) | 4.23 (3.63−4.89) | 4.29 (3.64−5.00) | 0.409 |
| HDLC, mmol/L | 1.27 (1.05−1.51) | 1.23 (1.02−1.44) | 1.39 (1.09−1.60) | < 0.001 |
| LDLC, mmol/L | 2.50 (1.99−3.04) | 2.50 (2.00−3.02) | 2.50 (1.97−3.05) | 0.872 |
| Plasma glucose, mmol/L | 4.47 (3.74−5.16) | 4.56 (3.87−5.33) | 4.38 (3.61−4.98) | < 0.001 |
| Glycolated plasma protein, mmol/L | 235.75 (218.70−254.70) | 233.10 (215.10−252.90) | 237.60 (222.30−256.40) | < 0.001 |
| SOD, IU/mL | 57.51 (52.27−62.18) | 52.62 (48.25−55.45) | 62.55 (60.09−66.70) | < 0.001 |