Table 1 Characteristics and clinical data of patients
|  | Conventional group (n = 37) | SPI group (n = 38) |
|---|---|---|
Age (years) | 74.6 ± 6.5 | 74.5 ± 5.2 |
Weight (kg) | 56.9 ± 12.1 | 59 ± 10.2 |
Height (cm) | 157.4 ± 10.3 | 159.2 ± 8.3 |
Sex (M/F) | 17/20 | 23/15 |
ASA physical status (I/II/III) | 0/30/7 | 0/32/6 |
Diabetes mellitus (no/yes) | 28/8 | 29/9 |
Hypertension (no/yes) | 20/16 | 15/23 |
Medication (no/yes) | ||
 Beta blocker | 35/2 | 30/8 |
 Calcium channel blocker | 27/10 | 24/14 |
 ARB or ACEi | 28/9 | 27/11 |
Preoperative chemotherapy (no/yes) | 32/5 | 33/5 |
Anesthesia time (min) | 171.0 ± 46.6 | 169.1 ± 52.9 |
Operation type | ||
 Hemicolectomy | 9 | 8 |
 Anterior resection | 14 | 16 |
 Low anterior resection | 11 | 10 |
 Othersa | 3 | 4 |