Table 1.

Patients' characteristics

	Total	Manual	Automatic
Age, years	61 ± 13	61 ± 13	62 ± 14
Sex, M/F	69/37	36/17	33/20
Type of surgery
Cardiac	41 (38.7%)	15 (28.3%)	26 (49.1%)
Thoracic	5 (4.7%)	3 (5.7%)	2 (3.8%)
Abdominal	52 (49.1%)	31 (58.5%)	23 (39.6%)
Others	8 (7.5%)	4 (7.5%)	4 (7.5%)
TOTAL	106 (100%)	53 (100%)	53 (100%)

Values of age are mean ± standard deviation. Values of gender are the number of patients of each group. In brackets are the percentages of patients in total and in each group.