Table 1 Comparison of demographic and associated medical problems between patients performing conversional RYGB after LSG and patients performing primary RYGB before and after propensity score matching

Age(years)

42.99 ± 7.26

37.81 ± 11.09

< 0.001*

42.74 ± 7.07

40.73 ± 10.97

0.052

Female Sex

135(87.1%)

407(72.9%)

< 0.001*

129(86.6%)

283(85.2%)

0.699

Weight

124.15 ± 18.39

133.04 ± 26.09

< 0.001*

124.70 ± 18.14

128.67 ± 24.42

0.076

Height

1.66 ± 0.07

1.67 ± 0.09

0.086

1.66 ± 0.07

1.67 ± 0.10

0.208

Pre-operative BMI

45.31 ± 7.37

47.65 ± 7.04

< 0.001*

45.53 ± 7.30

46.08 ± 6.45

0.408

Total hospital stays (days)

2.22 ± 0.81

2.02 ± 0.28

< 0.001*

2.23 ± 0.83

2.01 ± 0.22

0.002*

Operative time (min)

94.96 ± 19.08

42.621 ± 10.29

< 0.001*

94.72 ± 19.22

42.48 ± 9.92

< 0.001*

Preoperative associate medical problems

≥ 1 one problem

63(40.6%)

250(44.8%)

0.036*

59(39.6%)

140(42.2%)

0.569

IHD

3(1.9%)

53(9.5%)

0.002*

Dyslipidemia

33(21.3%)

213(38.2%)

< 0.001*

30(20.1%)

120(36.1%)

< 0.001*

DM

18(11.6%)

56(10.0%)

0.048

16(10.7%)

33(9.9%)

0.789

HTN

25(16.1%)

50(9.0%)

0.010*

23(15.4%)

26(7.8%)

0.011*

Combined surgery

No combined surgery

60(38.7%)

464(83.2%)

< 0.001*

56(37.6%)^b

273(82.2%)^a

< 0.001*

Cholecystectomy

10(6.5%)

51(9.1%)

10(6.7%)^a

33(9.9%)^a

Hiatal hernia repair

61(39.4%)

31(5.6%)

61(40.9%)^b

18(5.4%)^a

Cholecystectomy and hiatal hernia repair

24(15.5%)

12(2.2%)

22(14.8%)^b

8(2.4%)^a