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Table 3 Univariate and multivariable regression analysis for significant postoperative re-accumulation of seroma after drain removal

From: A novel technique of harmonic tissue dissection reduces seroma formation after modified radical mastectomy compared to conventional electrocautery: a single-blind randomized controlled trial

Covariate

Univariate CRR (95 % CI)

Multivariate ARR (95 % CI)

- Intervention

 Electrocautery

1

1

 Harmonic

0.032 (0.001 – 0.17)

0.036 (0.002 – 0.21)

- Age

 Up to 55

1

1

 ≥ 56

1.2 (0.65 – 2.14)

1.41 (0.74 – 2.56)

- Weight of specimen

 Up to 1000 g

1

1

 ≥ 1000 g

0.72 (0.41 – 1.56)

0.94 (0.57 – 1.98)

- Neoadjuvant therapy

 No

1

1

 Yes

1.1 (0.78 – 2.02)

1.3 (0.84 – 2.34)

- BMI

 Normal

1

1

 Overweight

0.71 (0.38 – 1.68)

0.76 (0.42 – 1.71)

 Obese

0.87 (0.49 – 1.96)

0.94 (0.65 – 2.07)

  1. CRR crude relative risk, CI confidence interval, ARR adjusted relative risk