|   | 
        HL512a | 
        HL468b | 
       
      
        |   | 
        correlation | 
        p | 
        coefficients | 
        p | 
        correlation | 
        p | 
        coefficients | 
        p | 
       
      
        | Age | 
        0.268 | 
        <0.001** | 
        NA | 
        0.255 | 
        0.001** | 
        NA | 
       
      
        | Sex | 
        0.068 | 
        0.378 | 
        0.163 | 
        0.034* | 
       
      
        | HOMA-IR | 
        0.038 | 
        0.628 | 
        0.028 | 
        0.713 | 
        0.173 | 
        0.025* | 
        0.156 | 
        0.035* | 
       
      
        | Metabolic syndrome (N/Y) | 
        0.023 | 
        0.764 | 
        0.016 | 
        0.826 | 
        0.054 | 
        0.485 | 
        0.048 | 
        0.527 | 
       
      
        | Elevated Fasting Plasma glucoseĀ   | 
        0.199 | 
        0.009* | 
        0.145 | 
        0.580 | 
        0.125 | 
        0.105 | 
        0.060 | 
        0.433 | 
       
      
        | Elevated Fasting Triglyceride level | 
        -0.095 | 
        0.220 | 
        -0.076 | 
        0.314 | 
        -0.033 | 
        0.670 | 
        -0.020 | 
        0.793 | 
       
      
        | Low HDL level  | 
        -0.039 | 
        0.618 | 
        -0.049 | 
        0.511 | 
        -0.004 | 
        0.957 | 
        -0.014 | 
        0.850 | 
       
      
        | Central Obesity | 
        0.009 | 
        0.911 | 
        0.014 | 
        0.855 | 
        0.079 | 
        0.306 | 
        0.084 | 
        0.262 | 
       
      
        | Elevated Blood Pressure | 
        0.018 | 
        0.814 | 
        -0.040 | 
        0.602 | 
        0.067 | 
        0.389 | 
        -0.005 | 
        0.950 | 
       
      
        | a: average hearing level at frequency 500, 1000 and    2000 Hz of bilateral ears 
          b: average hearing level at frequency 4000, 6000 and    8000 Hz of bilateral ears
          Regression coefficients: parameters controlled for age; for non-sex    dependent parameters (i.e. HOMA-IR, glucose level, triglyceride level, and    blood pressure), sex were also controlled. 
          For the    components of metabolic syndrome, binary observations were used: N=0 and Y=1. 
          *: p level <0.05
          **: p level <0.01 | 
       
      |