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Table 1 Characteristics of included trials and patients

From: Transabdominal Preperitoneal (TAPP) versus Lichtenstein operation for primary inguinal hernia repair – A systematic review and meta-analysis of randomized controlled trials

Author Abbas et al. [12] Anadol et al. [13] Hamza et al. [14] Heikkinen et al. [15] Köninger et al. [16, 17]/ Butters et al. [18] Picchio et al. [19] Pokorny et al. [20] Salma et al. [21]
Year 2012 2004 2010 1998 1998 1999 2008 2015
Country Egypt Turkey Egypt Finland Germany Latvia Austria Pakistan
Multicenter no no no no no no yes no
Period May 2008-Sept 2011 N/A N/A Dec 1994-Jun 1995 Jul 1995-Jun 1996 Nov 1996-Dec 1997 1998–2002 Jan 2009 - Dec 2009
Other repair techniques no no pre-peritoneal, TEP no Shouldice no Shouldice, Bassini, TEP no
Number of patients
 Lichtenstein 97 25 25 20 93 52 69 30
 TAPP 88 25 25 18 94 52 93 30
Agea, year, ±SD/ (range)
 Lichtenstein 34.6 ± 11.2 41.2 ± 10.9 35.12 ± 10.11 55.5b (26–69) 53b (26–74) 55.2 ± 12.4 52 (19–84) N/A
 TAPP 35.9 ± 12.104 41.8 ± 10.8 36.73 ± 12.06 51.0b (34–68) 53b (30–74) 57.7 ± 11.0 49 (21–78) N/A
Gender (m/f)
 Lichtenstein 94/3 25/0 25/0 20/0 93/0 40/12 64/5 30/0
 TAPP 86/2 25/0 25/0 17/1 94/0 37/15 86/7 30/0
Anesthesia both: GA + LA both: GA N/A open: LA, laparoscopic: GA both: GA open: LA, laparoscopic: GA both: GA N/A
F/Ua, months (range) 17.9b (8–30) 13.5 (8–28) up to 24 weeks 17b 52b (46–60) [16, 17] 1 up to 36 36.9 h
Jadad-Score 3 3 3 2 3 2 2 2
  1. aAll values are mean, except b median; [16,17,18] subsequent and supplementing publications; N/A not available, TEP Totally extraperitoneal endoscopic inguinal hernia repair, SD standard deviation, m male, f female, LA local anesthesia, RA regional anesthesia, GA general anesthesia, F/U Follow-up