Table 5.

Backward multiple linear regression models explaining the HIV epidemic

Explanatory variables	Standardized coefficients and variance inflation factors (VIF)
	Model 1	VIF	Model 2	VIF	Model 3	VIF
Contraceptive prevalence rate (X1)	−.021	2.140
Physicians density (X2)	−.270*	2.468	−.273*	2.407	−.208*	1.656
Proportion of Muslim	−.191*	1.319	−.187*	1.247	−.219**	1062
population (X3)
Adolescent fertility rate (X4)	.343**	2.093	.348**	1.997	.299**	1.581
Mean year of schooling (X5)	.142	3.485	.134	3.210
Adjusted R2	.608		.714		.811

^*Significant at p<.05 level, and

^**Significant at p<.01 level