|  | Lumbar Spine T-score | Femoral  neck     T-score | 
      
        | HIV    mono-infected  n = 129 | HIV/HCV co-infected n = 65 | HIV    mono-infected  n = 129 | HIV/HCV co-infected n = 65 | 
      
        |  | Analysis | Analysis | Analysis |  | 
      
        | Univariate | Multivariate | Univariate | Multivariate | Univariate | Multivariate | Univariate | Multivariate | 
      
        | Demographic/lifestyle characteristics |  | P< | β | P< |  | P< | β | P< |  | P< | β | P< |  | P< | β | P< | 
      
        | Age | -0.24* | 0.01 | - | - | -0.16 | ns | - | - | -0.22 | 0.01 | - | - | -0.18* | ns | - | - | 
      
        | BMI    (kg/m2) | 0.17* | Ns | - | - | 0.15* | ns | - | - | 0.25* | 0.01 | - | - | 0.27* | 0.04 | 0.36 | 0.03 | 
      
        | Menopause | -0.04° | ns | - | - | -0.3° | 0.02 | - | - | -0.03° | ns | - | - | -0.27° | 0.04 | - | - | 
      
        | Biochemical parameters | 
      
        | Bone alkaline phosphatase  
          (IU/L) | -0.3* | 0.01 | - | - | -0.26* | 0.05 | - | - | -0.28* | 0.02 | - | - | -0.34* | 0.02 | - | - | 
      
        | HDL-cholesterol (mg/dL ) | 0.08* | ns | - | - | 0.07* | ns | - | - | 0.04* | ns | - | - | 0.11* | ns | - | - | 
      
        | Characteristics of HIV infection | 
      
        | Nadir CD4+    < 200 
          (cells/μL) | -0.22° | 0.03 | - | - | -0.17° | ns | - | - | -0.28° | 0.01 | - | - | -0.17° | ns | - | - | 
      
        | Time    since HIV  
          diagnosis | -0.20* | 0.03 | - | - | -0.14* | ns | - | - | -0.14* | ns | - | - | -0.05* | ns | - | - | 
      
        | Score of    PI exposure | -0.2° | 0.02 | -0.33 | 0.02 | -0.25° | 0.05 | - | - | -0.25° | 0.01 | -0.5 | 0.0001 | -0.4° | 0.02 | -0.32 | 0.02 | 
    
HIV: Human Immunodeficiency Virus; HCV: Hepatitis C Virus; DXA: Dual-Energy X-Ray Absorptiometry; BMI: Body Mass Index; Ns: Not Significant; HDL: High-Density
Lipoprotein; PI: Protease Inhibitor. *R: Pearson’s Correlation Test; °Spearman’s Rank Correlation Test.