Peak expiratory flow rate variability in apparently healthy school children aged 10-15 years in Oredo, Nigeria.

Objective: To study the peak expiratory flow rate variability (PEFRVar) in apparently healthy school children in Oredo, Nigeria.

Methods: We carried out a cross-sectional study of 438 subjects (10-15 years), attending the public junior secondary schools, between March and November 2005. The study took place in the Oredo Local Government Area.