Inclusion Criteria:  The data of patients who applied to the emergency department with the complaint of acute (less than 4 weeks) low back pain or to the Physical Medicine and Rehabilitation outpatient clinic with the complaint of subacute (lasting 4-12 weeks) or chronic (longer than 12 weeks) non-specific low back pain in the last 3 years. The data of patients between the ages of 18-65.  Exclusion Criteria:  Patients who have systemic diseases or internal organ pathologies that may cause low back pain, acute/chronic infection, malignancy, rheumatic disease or systemic diseases that may change the hematological inflammation parameters, which are evaluation parameters, Patients who have severe neurological involvement findings in imaging examinations or clinical examination, Patients who have a history of surgical procedures for the lumbar region in the last 6 months Patients those missing one or more of the parameters planned to be evaluated within the scope of the screened data.