Case Control Study
Copyright ©The Author(s) 2021.
World J Clin Cases. Sep 16, 2021; 9(26): 7671-7681
Published online Sep 16, 2021. doi: 10.12998/wjcc.v9.i26.7671
Table 1 Patient characteristics

n (%)
Patients138
Male107 (77.5)
Age (mean ± SD, yr) 72.3 ± 10.5
PAD40 (29.0)
CBD diameter (mean ± SD, cm) 1.4 ± 0.6
CBD diameter ≥ 1.2 cm110 (79.7)
CBD diameter ≥ 1.5 cm73 (52.9)
Largest CBD stone diameter ≥ 1.2 cm68 (49.3)
CBD stone number ≥ 256 (40.6)
Muddy stones20 (14.5)
Initial ampullary intervention
EST8 (5.8)
EPBD/EPLBD79 (57.2)
ESBD28 (20.3)
CBD morphology
Straight type69 (50.0)
S type22 (15.9)
Polyline type47 (34.1)
Cholecystectomy8 (5.8)
Procedure time (mean ± SD, min)38.3 ± 19.5