[Quality of life and disease activity assessment in juvenile idiopathic arthritis].

Background: Juvenile idiopathic arthritis (JIA) is the most common chronic rheumatological disease in children. It is a multisystemic, dynamic pathophysiology of unknown cause and genetically heterogeneous.

Objective: To compare the quality of life and illness' activity in patients with juvenile idiopathic arthritis, from urban, suburban and rural areas.

Percentile distribution of the waist circumference among Mexican pre-adolescents of a primary school in Mexico City.

Aim: The aim of this study is to describe the percentile distribution of the waist circumference in Mexican pre-pubertal children living in an urban, middle-income area.

Methods: Children, aged 6-10, from a primary school, located in a middle-income area in Mexico City were included (n=833). Anthropometric measurements were made in the case of all children by using standardized procedures.