| 
      Data are reported as mean±SD (range)
        | Characteristics  | CLEB  | CLPB  | CLPSB | p-value  |  
        | Age, years  | 67.6±7.8 (52-78) | 68.4±8.8 (53-85) | 66.3±9.7 (50-79) | 0.6 |  
        | Sex, M/F | 14 / 10 | 9 / 13 | 10 / 12 | 0.5 |  
        | BMI, kg m-2 | 27.5±4.2 (21-35) | 28.1±4.1 (22-35) | 26.9±3.7 (20-33) | 0.7 |  
        | ASA I / II / III | 3 / 16 / 5 | 4 / 14 / 4 | 5 / 11 / 7 | 0.7 |  
        | Surgery duration,    min | 95.4±26.6 (60-155)  | 101.3±31.5 (60-175)  | 96.1±34.1 (60-180)  | 0.7 |  
        | Haemodynamics  |   |   |   |   |  
        | Pre-anesthesia |   |   |   |   |  
        |    Mean arterial pressure, mmHg | 95.2±13.3 (59-113) | 98.4±12.8 (70-119) | 100.1±13.2 (70-121) | 0.6 |  
        |    Heart rate | 72.7±8.0 (52-85) | 73.4±8.8 (55-93) | 71.1±5.1 (63-80) | 0.5 |  
        | Post-anesthesia |   |   |   |   |  
        |    Mean arterial pressure, mmHg | 72.7±12.6 (52-101) | 88.0±14.8 (63-114) | 89.6±18.6 (59-116) | 0.002 |  
        |    Heart rate  | 68.8±11.3 (46-87) | 72.1±10.8 (48-90) | 69.2±15.4 (48-120) | 0.5 |  
        | intra-surgery  |   |   |   |   |  
        | Incision  |   |   |   |   |  
        |    Mean arterial pressure, mmHg | 73.2±16.2 (48-114) | 71.0±14.6 (55-111) | 72.5±15.0 (49-95) | 0.8 |  
        |    Heart rate  | 61.8±9.7 (48-85) | 62.6±13.2 (42-87) | 62.5±7.7 (49-75) | 0.9 |  
        |  Femur cutting   |   |   |   |   |  
        |    Mean arterial pressure, mmHg | 70.0±18.2 (44-118) | 71.8±12.3 (50-98) | 67.2±9.3 (54-86) | 0.5 |  
        |    Heart rate  | 61.2±10.5 (44-85) | 63.7±12.1 (48-84) | 60.8±7.2 (51-76) | 0.8 |  
        | Acetabulus drilling |   |   |   |   |  
        | Mean arterial pressure, mmHg | 72.4±19.4 (51-117) | 70.2±10.7 (52-94) | 66.6±10.1 (46-89) | 0.7 |  
        |    Heart rate  | 62.3±11.5 (43-85) | 64.8±13.5 (46-84) | 61.5±8.6 (51-77) | 0.8 |  
        | End of surgery |   |   |   |   |  
        |    Mean arterial pressure, mmHg | 77.3±16.9 (55-113) | 83.5±14.6 (62-119) | 79.4±7.7 (63-97) | 0.3 |  
        |    Heart rate  | 68.1±10.3 (50-85) | 66.6±11.4 (45-87) | 68.9±13.3 (45-97) | 0.8 |  |