 The study aims to estimate worldwide prevalence of chronic low back pain according to age and sex by consulting electronic databases such as Medline, PubMed, Lilix and M-Base. The search strategy used descriptors like back pain, prevalence, musculoskeletal diseases, chronic musculoskeletal pain, rheumatic, low back pain, musculoskeletal disorders and chronic low back pain. Cross-sectional population-based or cohort studies that assess chronic low back pain as an outcome were selected. The review included 28 studies, with around one-third of them having low scores due to high non-response rates. Chronic low back pain prevalence was found to be higher in women and increased linearly from the third decade of life on until the 60 years of age. A standard chronic low back pain definition should include a precise description of the anatomical area, pain duration and limitation level for consistency and comparative analysis between studies. This article was authored by Rodrigo Dahlke Musi and Claudia Gast Alfassa and Ys Muller Xavier Faria. We are article.tv. Links in the description below.