 The objective of this study was to estimate the global prevalence of chronic low-back pain by age and gender. The researchers conducted a systematic literature review of cross-sectional population-based or cohort studies that assessed chronic low-back pain as an outcome. They found that the prevalence of chronic low-back pain was 4.2% in people aged 24-39 years old and 19.6% in people aged 20-59 years old. For people aged 18 and over, the prevalence of chronic low-back pain was 3.9% to 10.2%, 13.1% to 20.3%, and 25.4% in Brazil. These results suggest that chronic low-back pain is increasing linearly from the third decade of life onwards and is more common in women than men. Additionally, the authors recommend using a consistent definition for chronic low-back pain, including a precise description of the anatomical region, pain duration, and limitation level. This article was authored by Rodrigo Dalchimusi, Ana Claudia Gastalfassa, and Nisse Muller Xavier Faria. We are article.tv, links in the description below.