Table 3.
Univariable analysis of preoperative variables (main dataset)
| N (n = 6615) | Converted (n = 221) | p-Value | |
|---|---|---|---|
| Age# | <0.001#* | ||
| <30 | 803 | 3 (0.4%) | |
| 30–39 | 983 | 11 (1.1%) | |
| 40–49 | 1255 | 28 (2.2%) | |
| 50–59 | 1365 | 57 (4.2%) | |
| 60–69 | 1234 | 54 (4.4%) | |
| 70+ | 970 | 68 (7.0%) | |
| Gender | <0.001* | ||
| Female | 4889 | 111 (2.3%) | |
| Male | 1726 | 110 (6.4%) | |
| BMI# | 0.667# | ||
| <25 | 1318 | 42 (3.2%) | |
| 25–30 | 2261 | 76 (3.4%) | |
| 31–35 | 1536 | 50 (3.3%) | |
| >35 | 1198 | 43 (3.6%) | |
| ASA# | <0.001#* | ||
| 1 | 2505 | 28 (1.1%) | |
| 2 | 3340 | 131 (3.9%) | |
| 3+ | 712 | 57 (8.0%) | |
| Primary indication | <0.001* | ||
| Colic | 3647 | 45 (1.2%) | |
| CBD stone | 429 | 39 (9.1%) | |
| Cholecystitis | 1912 | 124 (6.5%) | |
| Pancreatitis | 623 | 13 (2.1%) | |
| Gallbladder wall | <0.001* | ||
| Normal | 4363 | 90 (2.1%) | |
| Thick walled | 2094 | 122 (5.8%) | |
| CBD diameter | <0.001* | ||
| Normal | 5449 | 145 (2.7%) | |
| Dilated | 1011 | 66 (6.5%) | |
| Admission type | <0.001* | ||
| Elective | 3125 | 52 (1.7%) | |
| Delayed | 2450 | 111 (4.5%) | |
| Acute | 1040 | 58 (5.6%) | |
| Preoperative ERCP | <0.001* | ||
| No | 5848 | 160 (2.7%) | |
| Yes | 692 | 58 (8.4%) | |
ASA – American Society of Anesthesiologists physical status classification system.
BMI – body mass index; CBD – common bile duct.
ERCP – Endoscopic Retrograde Cholangio-Pancreatography.
p-Values from Chi2 test, unless stated otherwise.
#p-Value from Kendall's tau.
*Significant at p < 0.05.