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Table 3 Subgroup analysis of postoperative outcomes

From: The safety of not implementing endoscopic nasobiliary drainage after elective clearance of choledocholithiasis: a systematic review and meta-analysis

Subgroup analysis

No. of studies

WMD

95%CI

p

Heterogeneity

(I2)

Normalization of total serum bilirubin (d)

Study design

 RCT

2

0.24

-0.02, 0.49

0.07

34%

Procedure

     

 Endoscope

3

0.23

0.07, 0.39

0.005

16%

Postoperative hospitalization duration (d)

Study design

 RCT

2

0.18

-0.07, 0.43

0.16

0%

 Cohort study

2

-1.52

-7.46, 4.42

0.62

99%

Procedure

 Endoscope

3

0.45

-0.02, 0.92

0.60

72%

  1. WMD: Weighted mean difference; CI: Confidence interval; RCT: Randomized controlled trial