Table 4.
Correlation coefficient (r), Regression coefficient (β) of multiple regression analysis.
| ParameterΨ | Correlation coefficient (r) (Significance 2-tailed, p) | Regression coefficient (β) (Significance, p) |
| Copper (R2 = 0.250) | ||
| Education | -0.126 (0.045) | -0.070 (0.291) |
| Age | 0.149 (0.018) | 0.126 (0.044) |
| BMI | -0.211 (0.001) | -0.181 (0.006) |
| Group | -0.471 (0.001) | |
| Zinc (R2 = 0.076) | ||
| Age | -0.148 (0.019) | -0.119 (0.058) |
| BMI | 0.205 (0.001) | 0.175 (0.008) |
| Group | -0.158 (0.003) | |
| Iron (R2 = 0.366) | ||
| Marital status | -0.132 (0.035) | -0.056 (0.281) |
| Group | 0.373 (0.001) | |
*Significant (p < 0.05) obtained from a t-test for regression coefficient (β)
ΨCopper, zinc and iron were taken as dependable variables. The independent variables (education, age, BMI, marital status) that were significantly correlated with the dependable variables were mentioned only. Group indicated: group 1 = drug dependent subjects, group 2 = non-dependent controls.