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. 2012 Apr 18;2012(4):CD001543. doi: 10.1002/14651858.CD001543.pub4

Zieren 1998.

Methods Single centre, three arms RCT ‐ comparisons: Shouldice vs Plug and patch vs TAPP (not considered for the analyses). 
 Randomization: computer generated. Allocation concealment not specified. 
 Maximum follow up: 25 months. 
 Exclusions after randomizations: not reported. 
 Analyses by protocol 
 Losses to follow up: none. 
 Jadad quality score: 3.
Participants Country: Germany. 
 Setting: centre not specialized in hernia repair. 
 Total enrolled patients: 160 (80 for each group) 
 Mean age (SD): Shouldice 46 (15); Plug and Patch 47 (14). 
 Gender:147 M, 13 F. 
 Inclusion criteria: Primary inguinal hernia repair, age >18. 
 Exclusion criteria: incarcerated hernias, coagulation disorders, contraindication for general anaesthesia, cardiac insufficiency (NYHA 3‐4). 
 Demographic and baseline data: comparability for age, sex, type of hernia (Nyhus), occupation, BMI (all data reported).
Interventions Shouldice modified (n=80). 4 layers. Unabsorbable monofilament. 
 Plug and Patch (n=80). Polypropylene meshes and plugs.
Outcomes Recurrence (method not stated). 
 Lenght of postoperative stay. 
 Chronic pain. 
 Wound Infection. 
 Seroma. 
 Haematoma. 
 Duration of operation.
Notes Recurrence at 25 months assessed for 96% of Shouldice group and 94% of Plug and Patch. 
 Conflict of interest: not reported. 
 Sources of funding: not reported.
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment (selection bias) Unclear risk B ‐ Unclear