Table 3 The influence factors for all complications, urine retention, and delayed bleeding

Univariable analysis

Age of 65 years or more vs. age < 65 years

1.15 (0.65, 2.04)

0.631

3.17 (1.27, 7.90)

0.013*

0.59 (0.25, 1.39)

0.231

Male vs. female

1.55 (1.02, 2.34)

0.038*

2.18 (0.88, 5.38)

0.091

1.40 (0.86, 2.27)

0.176

Hemorrhoids grade IV vs. III

2.76 (1.83, 4.16)

 < 0.001*

14.82 (4.36, 50.40)

 < 0.001*

1.91 (1.18, 3.10)

0.009*

ASA grade I

reference group

reference group

reference group

ASA grade II

1.10 (0.71, 1.70)

0.670

2.35 (0.79, 7.02)

0.127

0.96 (0.58, 1.59)

0.867

ASA grade III

When

0.151

6.67 (0.71, 63.14)

0.098

2.17 (0.47, 10.00)

0.322

Preoperative hemoglobin (g/dl)

0.98 (0.89, 1.07)

0.614

0.75 (0.65, 0.87)

 < 0.001*

1.06 (0.94, 1.19)

0.368

Operation time (min)

1.04 (1.02, 1.06)

0.001*

1.08 (1.04, 1.12)

 < 0.001*

1.02 (0.99, 1.04)

0.215

Postoperative pain score

1.26 (1.14, 1.40)

 < 0.001*

1.54 (1.25, 1.88)

 < 0.001*

1.13 (1.00, 1.28)

0.046*

Multivariable analysis

Age of 65 years or more vs. age < 65 years

3.54 (1.33, 9.42)

0.011*

Male vs. female

1.51 (0.99, 2.29)

0.055

3.08 (1.18, 8.05)

0.022*

Hemorrhoids grade IV vs. III

2.26 (1.47, 3.49)

 < 0.001*

8.31 (2.32, 29.73)

0.001*

1.72 (1.03, 2.88)

0.037*

Preoperative hemoglobin (g/dl)

0.76 (0.66, 0.89)

 < 0.001*

Postoperative pain score

1.18 (1.06, 1.31)

0.003*

1.40 (1.09, 1.79)

0.008*

1.09 (0.95, 1.24)

0.224