| 
      Data are presented as mean ± SD; ASA Class: American Society of anesthesiologist
    Classification
        | Variable | Paracetamol    group (n=40) | Placebo group (n=40) | P-value |  
        | Age(year) | 31.1 ± 4.2 | 28.6 ± 4.7 | 0.12 |  
        | Weight(kg) | 69.5 ± 10.1 | 66.0 ± 10.5 | 0.14 |  
        | ASA    Class(I/II) | 28/12 | 26/14 | 0.32 |  |