Table 1 Basic characteristics in the time of first postoperative flatus for patients undergoing colorectal surgeries

Female

396(46.30)

246(49.00)

0.96

0.33

Age (years)

62.08 ± 13.00

66.14 ± 12.95

-4.58

< 0.01

BMI^a

23.62 ± 3.54

23.53 ± 3.47

0.43

0.67

Right colectomy

266(31.10)

184(36.70)

4.45

0.04

Transverse colectomy

46(5.40)

21(4.20)

0.96

0.33

Left colectomy

81(9.50)

56(11.20)

1.00

0.32

Sigmoid colectomy

328(38.30)

156(31.10)

7.24

0.01

Proctectomy

196(22.90)

106(21.10)

0.58

0.45

Malignancy

808(94.40)

487(97.00)

4.91

0.03

Hypertension

545(63.70)

300(59.80)

2.06

0.15

CAD^b

107(12.50)

76(15.10)

1.89

0.17

Arrhythmia

54(6.30)

38(7.60)

0.80

0.37

Cerebral infarction

60(7.00)

50(10.00)

3.70

0.05

Encepalorrhagia

6(0.700)

4(0.800)

0.40

0.84

Hypothyroidism

11(1.30)

17(3.40)

6.92

0.01

Diabetes mellitus

157(18.30)

93(18.50)

0.01

0.93

COPD^c

37(4.30)

23(4.60)

0.05

0.82

Renal inadequacy

18(2.10)

16(3.20)

1.52

0.22

Hyperlipidemia

185(21.60)

95(18.90)

1.40

0.24

Hepatic inadequacy

15(1.80)

5(1.00)

1.25

0.26

Blood disease

10(1.20)

3(0.60)

1.09

0.30

History of alcohol

109(12.70)

75(14.90)

1.32

0.25

History of smocking

141(16.50)

90(17.90)

0.48

0.49

Preoperative chemotherapy

32(3.70)

23(4.60)

0.58

0.45

Preoperative anemia

356(41.60)

248(49.40)

7.82

0.01

Preoperative ileus

154(18.00)

116(23.10)

5.20

0.02

ASA I^d

115(13.40)

39(7.80)

20.57

< 0.01*

ASA II

621(72.50)

355(70.70)

ASA III

116(13.60)

102(20.30)

ASA IV

4(0.50)

6(1.20)

Soapsuds enema for bowel preparation

70(8.20)

65(12.90)

8.04

< 0.01

Oral laxatives for bowel preparation

805(94.00)

443(88.20)

14.28

< 0.01

Glycerin enema for bowel preparation

127(14.80)

89(17.70)

1.98

0.12

Oral antibiotic for bowel preparation

27(3.20)

32(6.40)

7.90

0.01

Laparotomy

399(46.60)

286(57.00)

13.59

< 0.01

Extended radical resection

773(90.30)

421(83.900)

12.36

< 0.01

Duration of operation (min)

203.07 ± 60.60

3215.71 ± 76.38

-3.17

< 0.01

Preoperative antibiotics

43(5.00)

44(8.80)

7.39

0.01

Preoperative fortified antibiotics

24(2.80)

26(5.20)

5.04

0.03

Postoperative fortified antibiotics

363(43.40)

234(46.60)

2.27

0.13

Duration of antibiotics (day)

7.02 ± 5.10

7.51 ± 4.31

-1.80

0.07

Time of postoperative feeding (day)

5.19 ± 2.10

6.55 ± 2.23

-10.19

< 0.01

Probiotics

258(27.60)

119(20.40)

6.53

0.01

Postoperative analgesia

806(94.2)

477(95.00)

0.45

0.50

None

50(5.80)

25(5.00)

2.11

0.55*

Opioids

749(87.50)

444(88.40)

Opioids & NSAIDs^e

46(5.40)

30(6.00)

NSAIDs

11(1.30)

3(0.60)

Duration of analgesia (day)

2.73 ± 1.02

2.91 ± 1.10

-3.10

< 0.01

Hypoproteinemia

688(80.40)

442(88.00)

13.34

< 0.01

Extraction of gastric tube (day)

1.69 ± 3.80

2.15 ± 2.43

-2.73

0.01

Extraction of drainage tube (day)

8.59 ± 5.98

9.68 ± 8.60

-2.72

0.01