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Table 1 Characteristics of included studies

From: Comparison between autologous blood transfusion drainage and closed-suction drainage/no drainage in total knee arthroplasty: a meta-analysis

Study LOEa Patients, no. Surgical method Agea M:F ratio Pre-op Hba
   A B C   A B C A B C A B C
Amin A 2008 [11] 1b 92 86 SU-TKA 70.3 70.4 43:49 39:47 13.2 (1.2) 13.4(1.3)
Zacharopoulos A 2007 [25] 2b 30 30 SU-TKA 69.2 70.2 6:24 7:23 NA NA
Abuzakuk T 2007 [10] 1b 52 52 SU-TKA NA NA 21:31 22:30 13.6(1.5) 13.5(1.2)
Kirkos JM 2006 [27] 2b 78 77 SU-TKA 69.1(5.5) 68.9(5.1) 18:60 10:67 13.0(1.4) 13.1(1.4)
Dramis A 2006 [26] 2b 25 24 SU-TKA NA NA NA NA NA NA
Cheng SC 2005 [28] 1b 26 34 SU-TKA 72 69.6 6:20 12:22 12.4 12.8
Thomas D 2001 [29] 1b 115 116 SU-TKA NA NA 44:71 55:61 NA NA
Adalberth G 1998 [20] 1b 30 30 30 SU-TKA 71(5.4) 72(8) 71(1.3) NA NA NA 13.8(1.1) 14.3(1.3) 14.2(2.6)
Newman J 1997 [30] 2b 35 35 SU-TKA NA NA NA NA 13.4 ± 1.2 13.2 ± 1.4
Heddle NM 1992 [21] 1b 39 40 SU-TKA 69.3(6.9) 71(9) 25:14 26:14 NA NA
Majkowski RS 1991 [31] 1b 20 20 SU-TKA 71.3 70.3 6:14 6:14 13.2 12.7
Horstmann W 2014 [33] 1b 59 56 SU-TKA 68(9) 69(8) 17:24   39:17 14(1.4) 14(1.4)
Dutton T 2012 [34] 2b 23 25 SU-TKA 68.7 70.5 10:13   10:15 NA NA
Thomassen BJ 2014 [32] 1b 88 87 SU-TKA 68.9 69.5 NA NA NA 14.2 14.2
Ritter MA 1994 [35] 2b 128 123 SU-TKA NA NA NA NA NA 13.0 13.1
  1. LOE Level of evidence, SU-TKA selective unilateral total knee replacement, B-TKA bilateral total knee replacement
  2. A autologous blood transfusion drainage, B conventional suction drain, C No drainage, NA data not available;. — = without this group ; aMean or Mean(SD)