Group | MDA (μM) | TAC(mM) | SOD (units) | ||||||
---|---|---|---|---|---|---|---|---|---|
Mean ± SD | t/F value | P value | Mean ± SD | t/F value | P value | Mean ± SD | t/F value | P value | |
Gender |  | −1.501 | 0.138 |  | −0.333 | 0.740 |  | −0.024 | 0.981 |
 Male | 1.870 ± 1.176 |  |  | 1.287 ± 0.177 |  |  | 0.354 ± 0.094 |  |  |
 Female | 2.171 ± 1.556 |  |  | 1.295 ± 0.159 |  |  | 0.354 ± 0.106 |  |  |
Age/years |  | 6.168 | < 0.001 |  | 2.905 | 0.034 |  | 1.681 | 0.170 |
 20~ | 1.815 ± 1.149 |  |  | 1.317 ± 0.176 |  |  | 0.337 ± 0.090 |  |  |
 30~ | 1.734 ± 1.107 |  |  | 1.274 ± 0.190 |  |  | 0.360 ± 0.093 |  |  |
 40~ | 2.238 ± 1.393abc |  |  | 1.301 ± 0.142 |  |  | 0.353 ± 0.104 |  |  |
 50~ | 1.719 ± 1.109 |  |  | 1.253 ± 0.193a |  |  | 0.363 ± 0.087 |  |  |
Marital Status | −2.595 | 0.010 |  | 1.594 | 0.112 |  | −0.622 | 0.534 | |
 Single | 1.697 ± 0.945 |  |  | 1.309 ± 0.184 |  |  | 0.349 ± 0.100 |  |  |
 Married | 1.973 ± 1.302 |  |  | 1.281 ± 0.171 |  |  | 0.355 ± 0.094 |  |  |
Education level | 3.313 | 0.020 | Â | 1.922 | 0.125 | Â | 0.580 | 0.629 | |
 High School and below | 1.770 ± 1.241 |  |  | 1.236 ± 0.201 |  |  | 0.345 ± 0.095 |  |  |
 Junior college | 2.126 ± 1.359d |  |  | 1.298 ± 0.155 |  |  | 0.347 ± 0.088 |  |  |
 Undergraduate | 1.915 ± 1.220 |  |  | 1.293 ± 0.180 |  |  | 0.358 ± 0.097 |  |  |
 Master and above | 1.570 ± 0.901 |  |  | 1.288 ± 0.157 |  |  | 0.358 ± 0.103 |  |  |
Working years/years | 4.285 | 0.005 | Â | 1.012 | 0.387 | Â | 1.764 | 0.153 | |
  < 10 | 1.759 ± 1.149 |  |  | 1.293 ± 0.180 |  |  | 0.345 ± 0.090 |  |  |
 10~ | 2.005 ± 1.255 |  |  | 1.298 ± 0.178 |  |  | 0.348 ± 0.100 |  |  |
 20~ | 2.168 ± 1.369ef |  |  | 1.292 ± 0.158 |  |  | 0.368 ± 0.102 |  |  |
 30~ | 1.693 ± 1.063 |  |  | 1.259 ± 0.185 |  |  | 0.356 ± 0.088 |  |  |
Work category | 2.368 | 0.052 | Â | 1.915 | 0.107 | Â | 2.166 | 0.072 | |
 Management | 1.877 ± 1.141 |  |  | 1.213 ± 0.218 |  |  | 0.375 ± 0.105 |  |  |
 Maintenance | 2.088 ± 1.374 |  |  | 1.269 ± 0.170i |  |  | 0.358 ± 0.090 |  |  |
 Dispatching | 1.601 ± 0.992 |  |  | 1.278 ± 0.231 |  |  | 0.395 ± 0.115 |  |  |
 Substation operation | 1.771 ± 1.108 |  |  | 1.296 ± 0.175 |  |  | 0.345 ± 0.097 |  |  |
 Other | 2.025 ± 1.275 |  |  | 1.325 ± 0.146 |  |  | 0.351 ± 0.091 |  |  |
Shift system |  | 0.043 | 0.966 |  | −1.417 | 0.157 |  | −0.248 | 0.804 |
 Day shift | 1.909 ± 1.219 |  |  | 1.281 ± 0.176 |  |  | 0.353 ± 0.098 |  |  |
 Shift work | 1.904 ± 1.265 |  |  | 1.304 ± 0.171 |  |  | 0.356 ± 0.089 |  |  |
Monthly income/yuan | 0.578 | 0.630 | Â | 1.256 | 0.289 | Â | 0.988 | 0.398 | |
  < 5000 | 1.858 ± 1.346 |  |  | 1.314 ± 0.164 |  |  | 0.346 ± 0.105 |  |  |
 5000~ | 1.988 ± 1.285 |  |  | 1.273 ± 0.166 |  |  | 0.349 ± 0.087 |  |  |
 7000~ | 1.831 ± 1.064 |  |  | 1.292 ± 0.180 |  |  | 0.361 ± 0.090 |  |  |
 9000~ | 1.937 ± 1.325 |  |  | 1.282 ± 0.203 |  |  | 0.364 ± 0.123 |  |  |
Noise exposure | 0.856 | 0.392 | Â | 0.566 | 0.572 | Â | 0.228 | 0.820 | |
 No | 1.940 ± 1.244 |  |  | 1.291 ± 0.167 |  |  | 0.355 ± 0.093 |  |  |
 Yes | 1.843 ± 1.206 |  |  | 1.282 ± 0.189 |  |  | 0.353 ± 0.101 |  |  |
Electromagnetic radiation exposure | 3.552 | < 0.001 |  | 0.841 | 0.401 |  | 0.359 | 0.720 | |
 No | 2.165 ± 1.393 |  |  | 1.296 ± 0.180 |  |  | 0.356 ± 0.093 |  |  |
 Yes | 1.753 ± 1.096 |  |  | 1.283 ± 0.171 |  |  | 0.353 ± 0.097 |  |  |
High-temperature and high-altitude operation | −1.471 | 0.142 |  | 0.872 | 0.384 |  | −1.176 | 0.240 | |
 No | 1.810 ± 1.085 |  |  | 1.296 ± 0.181 |  |  | 0.348 ± 0.093 |  |  |
 Yes | 1.965 ± 1.309 |  |  | 1.283 ± 0.171 |  |  | 0.358 ± 0.097 |  |  |
Visual display terminal operation | −0.510 | 0.611 |  | 1.083 | 0.280 |  | −1.040 | 0.299 | |
 No | 1.888 ± 1.188 |  |  | 1.294 ± 0.164 |  |  | 0.351 ± 0.094 |  |  |
 Yes | 1.946 ± 1.315 |  |  | 1.275 ± 0.194 |  |  | 0.360 ± 0.099 |  |  |
Smoking |  | 1.116 | 0.265 |  | 2.272 | 0.023 |  | −0.771 | 0.441 |
 No | 1.947 ± 1.279 |  |  | 1.299 ± 0.171 |  |  | 0.352 ± 0.101 |  |  |
 Yes | 1.817 ± 1.112 |  |  | 1.262 ± 0.181 |  |  | 0.358 ± 0.081 |  |  |
Drinking |  | −0.246 | 0.806 |  | 2.691 | 0.007 |  | −1.410 | 0.159 |
 No | 1.889 ± 1.282 |  |  | 1.314 ± 0.159 |  |  | 0.346 ± 0.094 |  |  |
 Yes | 1.917 ± 1.205 |  |  | 1.273 ± 0.181 |  |  | 0.358 ± 0.096 |  |  |
Exercise |  | 0.198 | 0.843 |  | 1.642 | 0.101 |  | −0.178 | 0.859 |
 No | 1.913 ± 1.204 |  |  | 1.295 ± 0.171 |  |  | 0.354 ± 0.092 |  |  |
 Yes | 1.889 ± 1.316 |  |  | 1.266 ± 0.185 |  |  | 0.355 ± 0.106 |  |  |
Sleeping time/h | 0.500 | 0.607 | Â | 0.228 | 0.796 | Â | 2.824 | 0.060 | |
  < 6 | 1.862 ± 1.162 |  |  | 1.280 ± 0.172 |  |  | 0.363 ± 0.103 |  |  |
 6~ | 1.965 ± 1.288 |  |  | 1.291 ± 0.178 |  |  | 0.357 ± 0.090 |  |  |
 7~ | 1.852 ± 1.206 |  |  | 1.292 ± 0.173 |  |  | 0.337 ± 0.094 |  |  |