Statistical methods
hematoma
CHRONIC PAIN, SECONDARY, HEMATOMA
Meshes were compared based on the time until the first occurrence of foreign body sensation within the first year after surgery using a Cox proportional hazards model (factor “mesh”; block factor “surgeon”; no interaction; test of the main effect “mesh”; two-sided 5% significance level). The secondary endpoints “rate of hematoma after 5 days” and “rate of chronic pain after 24 months” were analyzed using the Mantel–Haenszel chi-square test stratified by surgeon. In addition, the PCS and MCS summary scores of the SF-36