Table 5 Descriptive analysis for each variable used
The preventive (negative) interaction effect between blood chromium levels and glycohemoglobin levels on albuminuria (micro and macro) | ||||
Environmental exposure | Normal chromium | Abnormal chromium | NA | |
 Number of subjects | 1312 | 29 | 55 | |
 Mean | 0.35 μg/L | 2.02 μg/L | NA | |
 Outcome (disease) | No albuminuria | Albuminuria | NA | |
 Number of subjects | 1089 | 270 | 37 | |
 Mean | 9.49 mg/g | 504.0 mg/g | NA | |
 Susceptibility factor | Blood glycohemoglobin level (with 48 NA values) | |||
 Statistics | Min | Median | Mean | Max |
 Value | 4.1% | 6.0% | 6.39% | 16.5% |
The aggravating (positive) interaction effect between blood cobalt levels and old ages on albuminuria (micro and macro) | ||||
Environmental exposure | Normal cobalt | Abnormal cobalt | NA | |
 Number of subjects | 6942 | 32 | 312 | |
 Mean | 0.18 μg/L | 6.04 μg/L | NA | |
 Outcome (disease) | No albuminuria | Albuminuria | NA | |
 Number of subjects | 5919 | 1179 | 188 | |
 Mean | 9.28 mg/g | 335.0 mg/g | NA | |
 Susceptibility factor | Age in years (with no NA value) | |||
 Statistics | Min | Median | Mean | Max |
 Value | 40.0 yrs | 60.0 yrs | 60.28 yrs | 80.0 yrs |