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Table 1 The characteristics of patients in seroma and no seroma groups and univariate odds ratio.

From: Seroma formation after surgery for breast cancer

  Seroma group (n = 55) n. (%) No seroma group (n = 103) n. (%) OR (95% CI)* p value**
Age (years)     0.22
<40 12 (21.8) 34 (33.0) 1.00 (ref.)  
40–49 20 (36.4) 38 (36.9) 1.49 (0.63–3.49)  
>50 23 (41.8) 31 (30.1) 2.10 (0.89–4.92)  
Tumor size (cm)     0.64
<2 21 (38.2) 47 (45.6) 1.00 (ref.)  
2–5 21 (38.2) 34 (33.0) 1.42 (0.67–3.01)  
>5 13 (23.6) 22 (21.3) 1.26 (0.53–2.96)  
Nodal involvement (n = 152)     0.31
No 14 (26.4) 34 (36.8) 1.00 (ref.)  
Yes 39 (73.6) 65 (65.7) 1.45 (0.69–3.04)  
Surgical procedure     0.03
Breast conservation 10 (18.2) 33 (32.0) 1.00 (ref.)  
Modified radical mastectomy 45 (81.8) 70 (68.0) 2.12 (0.95–4.72)  
Surgical instrument     0.06
Scalpel 8 (14.5) 23 (22.3) 1.00 (ref.)  
Cautery 47 (85.5) 80 (77.7) 1.68 (0.70–4.07)  
Neoadjuvant chemotherapy     0.22
No 46 (83.6) 93 (90.3) 1.00 (ref.)  
Yes 9 (16.4) 10 (9.7) 1.82 (0.69–4.78)  
Pressure garment     0.63
Yes 12 (21.8) 26 (25.2) 1.00 (ref.)  
No 43 (78.2) 77 (74.8) 1.21 (0.55–2.63)  
Axillary drainage time (days/n= 152)     0.64
>10 8 (15.1) 20 (20.2) 1.00 (ref.)  
5–10 30 (56.6) 49 (49.5) 1.53 (0.59–3.90)  
<5 15 (28.3) 30 (30.3) 1.25 (0.44–3.49)  
  1. * Odds ratios derived from univariate logistic regression analysis.
  2. ** P values derived from the Chi-squared test.