Core Muscle Strength in Women with Primary Dysmenorrhoea

Inclusion Criteria: * Participants must meet the following criteria to be included in the study: Age between 18 and 35 years Diagnosed with Primary Dysmenorrhea (PD) according to the PD consensus criteria, which include: Presence of menstrual pain within the first few years after menarche A Visual Analog Scale (VAS) pain score of 4 or higher in the last six months No pelvic pathology Having a regular menstrual cycle (21-35 days) No uterine disorders Exclusion Criteria: The sample size for the study was determined using the G\*Power software (latest version 3.1.9.7; Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany). Since our study consists of two groups (participants with and without Primary Dysmenorrhea), the power analysis was conducted using the "Means: Difference between two independent means (two groups)" method. Based on similar studies, an effect size of d = 0.726 was used for the calculation. With a statistical power of 80% and a significance level of 5% (α = 0.05), the minimum required sample size was determined to be at least 25 participants per group, totaling 50 participants.Pregnancy or suspicion of pregnancy Active sexual life History of childbirth Use of an intrauterine device (IUD) History of surgery involving the abdomen, spine, or pelvic region within the last year Diagnosis of secondary dysmenorrhea Body mass index (BMI) of 30 or higher