Differences in the annual growth rates of lung function# between active and inactive children.

Active: physically active at either survey or both surveys; Inactive: physically inactive at both surveys.dpy:difference per year;#Adjusted for district, age in 2008, height in 2006, change in height between 2006 and 2008, BMI in 2006, change in BMI between 2006 and 2008, lung function indices in 2006, passive smoking, and maternal education.*p