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Table 1 Impact of patient/physician-related characteristics on conversion calculated using univariate analysis

From: Evaluation of the conversion rate as it relates to preoperative risk factors and surgeon experience: a retrospective study of 4013 patients undergoing elective laparoscopic cholecystectomy

 

Laparoscopic cholecystectomy

Converted cholecystectomy

P value

Number of patients (%)

3846 (95.84%)

167 (4.16%)

Age (years)

Mean ± SD

54.09 ± 14.72

61.54 ± 13.60

 < 0.0011

20–65

2893

101 (3.37%)

 < 0.0012

65 + 

953

66 (6.48%)

80 + 

86

15 (14.85%)

Gender

Men

1009

74 (6.83%)

 < 0.0012

Women

2837

93 (3.17%)

Lower abdominal surgery (N/A: 397)

No

2208

84 (4.76%)

0.1162

Yes

1261

63 (3.66%)

Upper abdominal surgery (N/A:397)

No

3335

116 (3.36%)

 < 0.0012

Yes

134

31 (18.78%)

Acute cholecystitis in patient history (N/A:350)

No

3258

114 (3.38%)

 < 0.0012

Yes

256

35 (12.03%)

Timing of surgery (N/A: 41)

Between 3–6 weeks

42

6 (12.50%)

0.8044

After 6 weeks

179

23 (11.39%)

ERCP in patient history (N/A:1)

No

3411

125 (3.54%)

 < 0.0012

Yes

434

42 (8.82%)

Indication for ERCP

Acute biliary pancreatitis

98

9

Not tested

Moderate biliary tract obstruction

90

9

Severe biliary tract obstruction

184

20

Other indication

62

4

Surgeon’s annual surgery volume (N/A:69)

1–10 per year

889

38 (4.10%)

0.6853

11–40 per year

2191

102 (4.45%)

 > 40 per year

697

27 (3.73%)

Mean ± SD

27.53 ± 22.45

2 7.26 ± 20.88

0.8811

Surgical experience (years)

0–6 years

699

20 (2.78%)

0.0033

7–15 years

1209

42 (3.36%)

 > 15 years

1869

105 (5.32%)

Mean ± SD

16.23 ± 9.46

21.09 ± 11.99

 < 0.0011

  1. 1Welch's t-test; 2Fisher exact test; 3Chi-Square test
  2. N number of patients, ERCP endoscopic retrograde cholangiopancreatography