Table 3.
Univariate and multivariate analysis of factors potentially affecting the risk of conversion
| Variable | n | Conversion, n (%) | Univariate, p | Risk ratio (95% confidence interval) | Multivariate, p | |
|---|---|---|---|---|---|---|
| Age | ns | |||||
| <70 | 69 | 8 (11.6) | ||||
| >70 | 21 | 2 (9.5) | ||||
| Sex | ns | |||||
| Male | 45 | 6 (13.3) | ||||
| Female | 45 | 4 (8.9) | ||||
| BMI | 0.048 | |||||
| <25 | 72 | 7 (9.7) | ||||
| >25 | 18 | 3 (16.7) | ||||
| ASA Score | ns | |||||
| 1–2 | 81 | 9 (11.1) | ||||
| 3 | 9 | 1 (11.1) | ||||
| Previous abdominal surgery | 0.05 | |||||
| Yes | 21 | 3 (14.3) | ||||
| No | 69 | 7 (10.1) | ||||
| Indication | ns | |||||
| Malignant | 79 | 9 (11.4) | ||||
| Benign | 11 | 1 (9.1) | ||||
| Extent of hepatectomy | 0.034 | 0.043 | ||||
| Minor | 80 | 7 (8.8) | 1 | |||
| Major | 10 | 3 (30) | 1.35 (1.01–1.85) | |||
| Lesion location | 0.031 | 0.032 | ||||
| Laparoscopic segment | 67 | 6 (9) | 1 | |||
| Non-laparoscopic segment | 23 | 4 (17.4) | 1.38 (1.19–1.99) | |||
| Number of lesions | ns | |||||
| Single | 73 | 8 (11) | ||||
| Multiple | 17 | 2 (11.8) | ||||
| Lesion diameter | 0.048 | |||||
| <5 cm | 59 | 5 (8.5) | ||||
| >5 cm | 31 | 5 (16.1) | ||||
| Underlying liver impairment | 0.046 | |||||
| Yes | 43 | 6 (14) | ||||
| No | 47 | 4 (8.5) | ||||
| Length of surgery | ns | |||||
| <180 min | 50 | 5 (10) | ||||
| >180 min | 40 | 5 (12.5) | ||||
| Pringle manoeuver | ns | |||||
| Yes | 47 | 6 (12.8) | ||||
| No | 43 | 4 (9.3) | ||||
| Intraoperative preload monitoring | 0.026 | 0.031 | ||||
| CVP | 45 | 8 (17.8) | 1.75 (1.39–2.14) | |||
| SVV | 45 | 3 (6.7) | 1 | |||
Abbreviations: ASA, America Society of Anesthesiology; SVV, stroke volume variation; CVP, central venous pressure.