Table 4. Multiple linear regression analysis for relationship between SOD and blood pressure stratified by gender, overweight, category of residence and CVD diseases.
| Subgroup | DBP, mmHg | SBP, mmHg | |||||
| B (95% CI) | P | Interaction P | B (95%CI) | P | Interaction P | ||
| Adjusted for age, gender, current status of smoke, alcohol drinking, exercise, disease history (diabetes, stroke, and heart disease), BMI and blood biomarkers (total cholesterol, LDLC, HDLC, hs-CRP, creatine and plasma glucose). BMI: body mass index; BP: blood pressure; CRP: C-reactive protein; CVDs: cardiovascular diseases; HDLC: high-density lipoprotein cholesterol; HR: heart rate; LDLC: low-density lipoprotein cholesterol; SOD: superoxide dismutase. | |||||||
| Gende | |||||||
| Male | −0.098 (−0.184, −0.012) | 0.026 | 0.5394 | −0.004 (−0.172, 0.163) | 0.958 | 0.3324 | |
| Female | −0.105 (−0.198, −0.012) | 0.027 | −0.080 (−0.252, 0.092) | 0.360 | |||
| BMI, kg/cm2 | |||||||
| BMI < 25 (normal) | −0.101 (−0.169, −0.033) | 0.004 | 0.5192 | −0.044 (−0.175, 0.087) | 0.507 | 0.8524 | |
| BMI ≥ 25 (overweight) | −0.034 (−0.193, 0.124) | 0.670 | −0.018 (−0.297, 0.262) | 0.901 | |||
| Waist circumference, cm | |||||||
| Normal male < 90 yrs; female < 85 yrs | −0.089 (−0.161, −0.017) | 0.015 | 0.7233 | 0.015 (−0.120, 0.150) | 0.823 | 0.3002 | |
| Overweight male ≥ 90 yrs; female ≥ 85 yrs | −0.070 (−0.198, 0.058) | 0.285 | −0.166 (−0.416, 0.083) | 0.191 | |||
| Category of residence | |||||||
| City and town | −0.088 (−0.235, 0.058) | 0.237 | 0.9213 | −0.246 (−0.506, 0.015) | 0.064 | 0.0867 | |
| Rural | −0.083 (−0.153, −0.013) | 0.019 | 0.016 (−0.118, 0.149) | 0.815 | |||
| Suffering from disease (CVDs) | |||||||
| Heart disease | −0.067 (−0.304, 0.171) | 0.579 | 0.4536 | −0.034 (−0.446, 0.378) | 0.871 | 0.7638 | |
| No heart disease | −0.090 (−0.156, 0.025) | 0.007 | −0.022 (−0.146, 0.102) | 0.727 | |||
| Stroke | −0.295 (−0.534, −0.057) | 0.016 | 0.7401 | 0.015 (−0.396, 0.426) | 0.942 | 0.5760 | |
| No stroke | −0.078 (−0.143, −0.014) | 0.017 | 0.032 (−0.093, 0.157) | 0.611 | |||
| Diabetes | 0.077 (−0.399, 0.533) | 0.742 | 0.6627 | −0.035 (−1.023, 0.954) | 0.943 | 0.4444 | |
| No diabetes | −0.097 (−0.159, −0.034) | 0.003 | 0.022 (−0.099, 0.142) | 0.726 | |||
| SOD | |||||||
| SOD < 58 IU/mL | −0.205 (-0.327, -0.082) | 0.001 | 0.0038 | 0.005 (-0.222, 0.232) | 0.859 | 0.8060 | |
| SOD > 58 IU/mL | 0.039 (-0.086, 0.164) | 0.542 | −0.053 (−0.295, 0.190) | 0.750 | |||