Table 3:
Backward multiple linear regression models explaining the life expectancy
| Explanatory Variables | Standardized coefficients and variance inflation factors (VIF) | |||||
|---|---|---|---|---|---|---|
| Model 1 | VIF | Model 2 | VIF | Model 3 | VIF | |
| HIV prevalence rate (X1) | -0.42** | 1.26 | -0.42** | 1.26 | -0.40** | 1.11 |
| Physicians density (X2) | 0.10 | 3.00 | 0.10 | 2.99 | ||
| Total fertility rate (X3) | -0.43** | 4.41 | -0.49** | 2.69 | -0.48** | 2.66 |
| Adolescent fertility rate (X4) | -0.08 | 2.45 | ||||
| Mean years of schooling (X5) | 0.20* | 3.32 | 0.20* | 3.32 | 0.13* | 1.94 |
| Gross National Income (X6) | 0.22** | 2.19 | 0.20** | 2.10 | 0.20** | 2.09 |
| Adjusted R2 | 0.62 | 0.71 | 0.78 | |||
Note: *Significant at P<0.05 level, and ** Significant at P<0.01 level