| 
      
        | Periods | Plasma level of PHT | Values (mcg/ml)  | n (%)  |  
        | Preoperative | Therapeutic range  | 13.93 ± 3.02  | 16 (80%)  |  
        | ( 13.6 ± 4.63 mcg/ml) | Low  | 5.76 ± 0.06  | 3 (15%)  |  
        |   | High  | 23  | 1 (5%)  |  
        | Intraoperative | Therapeutic range  | 14.3 ± 3.16  | 10 (50%)  |  
        | ( 13.26 ± 8.02 mcg/ml)  | Low  | 7.29 ± 1.69  | 8 (40%)  |  
        |   | High  | 31.9 ± 11.46 | 2 (10%)  |  
        | Postoperative | Therapeutic range  | 15.76 ± 2.66  | 7 (35%)  |  
        | ( 18.94 ± 7.6 mcg/ml) | Low  | 8.63 ± 1.85  | 3 (15%)  |  
        |   | High  | 25.43 ± 4.17  | 10 (50%)  |  |