Participants and sample size
first-degree tears, pain
The population consisted of women with first- or second-degree spontaneous perineal tears or episiotomy. After delivery, this population was allocated into two experimental groups (EG) and two control groups (CG). The EG consisted of EG1: women who underwent repair of first-degree tears with glue, and EG2: women who underwent repair of second-degree tears or episiotomy with glue. The CG were as follows: CG1: women who underwent repair of first-degree tears with polyglactin 910 thread; and CG2: women who underwent repair of second-degree tears or episiotomy with polyglactin 910 thread.The Bioestat® 5.3 software was used to estimate the sample size. The sample was constituted to detect a significant minimum difference of 2 points in the pain score between both perineal repair methods. 