| SL no | Parameters (unit) | Grade-I 
          (n=10) | Grade-II 
          (n=29) | Grade-III
          (n=11) | p-value | 
      
        | 1 | Age
          (yrs) | 51.6 ± 10.2 
          (38-72) | 52.5 ± 8.8 
          (39-70) | 48.5 ± 13.5
          ( 30-76) | 0.547 | 
      
        | 3 | MAJX 
          (μm) | 12.87 ±1.82 
          (10.08-15.97) | 12.93 ± 1.76 
          (10.12-19.02) | 14.67 ± 1.90 
          ( 10.72-16.79) | 0.023* | 
      
        | 3 | MINX 
          (μm) | 9.95 ± 1.37 
          ( 7.66-12.55) | 10.44 ± 1.18 
          (7.71-14.15) | 11.51 ± 1.72 (7.91-13.33) | 0.027* | 
      
        | 4 | NA 
          (μm2) | 102.62 ± 28.60 
          (60.83-159.28) | 108.13 ± 28.30 
          (60.89-213.68) | 136.41 ± 35.14
          (67.79-172.53) | 0.019* | 
      
        | 5 | NP 
          (μm) | 35.82 ± 4.94 
          (27.85-44.78) | 36.69 ± 4.56 
          (27.91-52.07) | 41.11 ± 5.66 
          ( 29.27-46.57) | 0.025* | 
      
        | 6 | NAR | 1.33 ± 0.06 
          (1.24-1.43) | 1.26 ± 0.05 
          (1.16-1.38) | 1.28 ± 0.04 (1.22-1.33) | 0.001* | 
      
        | values are expressed as:  mean ± standard deviation (minimum value – maximum value), n- number of sample, *-difference is significant |