The objective was to document the operational definitions applied in epidemiological
studies of chronic pain and to examine whether pain definitions and other methodological …

Chronic pain (CP) is prevalent worldwide. Current reports on its prevalence in develo**
countries are heterogeneous, and to date, there is no quantitative synthesis providing a …

Pain and substance use are highly prevalent and co-occurring conditions that continue to
garner increasing clinical and empirical interest. Although nicotine and tobacco, alcohol …

Pain and alcohol use are both highly prevalent in the general population, and pain–alcohol
interrelations are of increasing empirical interest. Previous research has identified …

Background and Objectives. Chronic pain affects between 30% and 50% of the world
population. Our objective was to estimate the prevalence of chronic pain in Brazil, describe …

Background Chronic pain is recognized as a public health problem that affects the general
population physically, psychologically, and socially. However, there is little knowledge about …

Disability related to chronic low back pain (CLBP) is a complex and multidimensional
phenomenon. The aim of the study was to identify the prevalence of disability and factors …

CONTEXT: Chronic pain (CP) with and without neuropathic characteristics is a public health
problem. This is the first population-based study in South America, and the third in the world …

Methods for classifying chronic pain in population studies are highly variable, and
prevalence estimates ranges from 11% to 64%. Limited knowledge about the persistence of …

Background. There are very few studies that had a sample size sufficient to explore the
association between factors related to low back pain in a representative sample of the …