Patient demographics and clinical characteristics
| Continuous infusion group | Single injection group | |
| Sample size, n | 27 | 27 |
| Sex, n (%) | ||
| Female | 16 (59.3) | 13 (48.1) |
| Male | 11 (40.7) | 14 (51.9) |
| Mean age (SD) in years | 65 (10) | 64 (13) |
| Mean weight (SD) in kg | 71 (15) | 81 (19) |
| Mean height (SD) in cm | 167 (10) | 168 (10) |
| Mean BMI (SD) in kg/m2 | 25.5 (4.6) | 28.7 (5.8) |
| ASA score, n (%) | ||
| I | 4 (14.8) | 5 (18.5) |
| II | 21 (77.8) | 17 (63.0) |
| III | 2 (7.4) | 5 (18.5) |
| Type of surgery, n (%) | ||
| Shoulder arthroplasty | 11 (40.7) | 11 (40.7) |
| Rotator cuff repair | 16 (59.3) | 16 (59.3) |
| Mean duration of surgery (SD) in min | 101 (31) | 106 (21) |
ASA, American Society of Anesthesiologists; BMI, body mass index.