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Table 1 Patient characteristics and bias for urgent versus elective operation

From: Urgent surgery after emergency presentation for colorectal cancer has no impact on overall and disease-free survival: a propensity score analysis

  

Patient characteristics in univariate analysis

Bias in multivariable logistic regression

Patient characteristics after propensity score matching

  

Total N = 747

Urgent N = 84

Elective N = 663

p

OR (95 % CI)

p c

Urgent N = 83

Elective N = 621

p

Age

years

71.4 ± 12.1

72.0 ± 11.2

71.3 ± 12.2

0.884a

1.01 (0.99–1.03)

0.490

72.1 ± 11.3

72.5 ± 11.7

0.760a

Sex

m

421 (56.4 %)

43 (51.2 %)

378(57.0 %)

0.311b

Reference

0.517

42 (50.6 %)

333.5 (53.7 %)

0.594b

 

w

326 (43.6 %)

41 (48.8 %)

285 (43.0 %)

 

1.19 (0.71–1.99)

 

41 (49.4 %)

287.5 (46.3 %)

 

Tumor localisation

Cecum

132 (17.7 %)

12 (14.3 %)

120 (18.1 %)

0.019b

Reference

0.092

12 (14.5 %)

95.4 (15.4 %)

0.927b

 

Ascending colon

130 (17.4 %)

12 (14.3 %)

118 (17.8 %)

 

1.25 (0.50–3.19)

 

12 (14.5 %)

82.4 (13.3 %)

 
 

Transverse colon

40 (5.4 %)

7 (8.3 %)

33 (5.0 %)

 

2.50 (0.80–7.43)

 

7 (8.4 %)

55.7 (9.0 %)

 
 

Descending colon

81 (10.8 %)

12 (14.3 %)

69 (10.4 %)

 

2.29 (0.88–6.01)

 

12 (14.5 %)

80.9 (13.0 %)

 
 

Sigmoid colon

201 (26.9 %)

32 (38.1 %)

169 (25.5 %)

 

1.95 (0.90–4.44)

 

31 (37.3 %)

258.1 (41.6 %)

 
 

Rectum

163 (21.8 %)

9 (10.7 %)

154 (23.2 %)

 

0.78 (0.28–2.12)

 

9 (10.8 %)

48.7 (7.8 %)

 

Perforation

No

674 (90.2 %)

56 (66.7 %)

618 (93.2 %)

<0.001b

Reference

<0.001

56 (67.5 %)

465.5 (75.0 %)

0.144b

 

Yes

73 (9.8 %)

28 (33.3 %)

45 (6.8 %)

 

7.17 (3.93–13.09)

 

27 (32.5 %)

155.5 (25.0 %)

 

Protective colostomy

No

657 (88.0 %)

71 (84.5 %)

586 (88.4 %)

0.306b

Reference

0.129

70 (84.3 %)

512.7 (82.6 %)

0.687b

 

Yes

90 (12.0 %)

13 (15.5 %)

77 (11.6 %)

 

1.82 (0.83–3.80)

 

13 (15.7 %)

108.3 (17.4 %)

 

Resection status

R0

718 (96.1 %)

76 (90.5 %)

642 (96.8 %)

0.014c

Reference

0.114

76 (91.6 %)

571.8 (92.1 %)

0.870b

 

R1/2

29 (3.9 %)

8 (9.5 %)

21 (3.2 %)

 

2.32 (0.81–6.09)

 

7 (8.4 %)

49.2 (7.9 %)

 

UICC Stage

I

166 (22.2 %)

13 (15.5 %)

153 (23.1 %)

0.332b

Reference

0.599

13 (15.7 %)

69.9 (11.3 %)

0.698b

 

II

212 (28.4 %)

23 (27.4 %)

189 (28.5 %)

 

1.41 (0.63–3.29)

 

23 (27.7 %)

172.4 (27.8 %)

 
 

III

220 (29.5 %)

27 (32.1 %)

193 (29.1 %)

 

1.30 (0.55–3.15)

 

26 (31.3 %)

209.8 (33.8 %)

 
 

IV

149 (19.9 %)

21 (25.0 %)

128 (19.3 %)

 

1.83 (0.72–4.71)

 

21 (25.3 %)

168.9 (27.2 %)

 

Tumor diameter

mm

45.8 ± 21.6

45.7 ± 20.6

45.8 ± 21.7

0.831a

0.99 (0.98–1.00)

0.107

45.6 ± 20.7

43.7 ± 19.3

0.421a

Lymph node yield

<12

166 (22.2 %)

10 (11.9 %)

156 (23.5 %)

0.016b

Reference

0.040

10 (12.0 %)

46.1 (7.4 %)

0.143b

 

12+

581 (77.8 %)

74 (88.1 %)

507 (76.5 %)

 

2.08 (1.03–4.58)

 

73 (88.0 %)

574.9 (92.6 %)

 

Tumor grading

G1

23 (3.1 %)

3 (3.6 %)

20 (3.0 %)

0.180b

Reference

0.196

3 (3.6 %)

29.2 (4.7 %)

0.823b

 

G2

540 (72.3 %)

53 (63.1 %)

487 (73.5 %)

 

0.45 (0.14–2.03)

 

52 (62.7 %)

355.9 (57.3 %)

 
 

G3

148 (19.8 %)

21 (25.0 %)

127 (19.2 %)

 

0.62 (0.17–2.99)

 

21 (25.3 %)

175.1 (28.2 %)

 
 

GX

36 (4.8 %)

7 (8.3 %)

29 (4.4 %)

 

1.21 (0.26–6.73)

 

7 (8.4 %)

60.7 (9.8 %)

 

Adjuvant Chemotherapy

No

505 (67.6 %)

51 (60.7 %)

454 (68.5 %)

0.152b

Reference

0.785

51 (61.4 %)

382.8 (61.6 %)

0.973b

 

Yes

242 (32.4 %)

33 (39.3 %)

209 (31.5 %)

 

1.09 (0.59–2.01)

 

32 (38.6 %)

238.2 (38.4 %)

 
  1. n (%); mean ± standard deviation
  2. Number of patients after elective operation with decimals because of weigthing in the propensity score matching analysis
  3. a Mann–Whitney U-test; b Chi-Square statistic; c Likelihood ratio test