Results The literature review and meta- analysis identified decreased PA and increased time spent in SB in these population s , which may exacerbate both their lower physical fitness and the symptoms of their health disorders .
Background Physical activity ( PA ) is essential for children throughout their growth and maturation .
It improves physiological and psychological health and limits the risk of developing metabolic disorders .
However , some chronic physiological and metabolic diseases may lead to decreased PA .
The diversity of outcomes in the literature offers no consensus for physical activity and sedentary levels in children with juvenile idiopathic arthritis ( JIA ) or inflammatory bowel disease ( IBD ) .
The aim was to examine  PA and SB  in children with JIA or IBD compared to their healthy peers .
Incidence and Prevalence of Juvenile Idiopathic Arthritis Among Children in a Managed Care Population, 1996–2009
Objective . Few studies based in well-defined North American population s have examined the occurrence of juvenile idiopathic arthritis ( JIA ) , and none has been based in an ethnically diverse population . We used computerized healthcare information from the Kaiser Permanente Northern California membership to vali date JIA diagnoses and estimate the incidence and prevalence of the disease in this well-characterized population . Methods . We identified children aged ≤ 15 years with ≥ 1 relevant International Classification of Diseases , 9th edition , diagnosis code of 696.0 , 714 , or 720 in computerized clinical encounter data during 1996–2009 . In a r and om sample , we then review ed the medical records to confirm the diagnosis and diagnosis date and to identify the best-performing case-finding algorithms . Finally , we used the case-finding algorithms to estimate the incidence rate and point prevalence of JIA . Results . A diagnosis of JIA was confirmed in 69 % of individuals with at least 1 relevant code . Forty-five percent were newly diagnosed during the study period . The age- and sex-st and ardized incidence rate of JIA per 100,000 person-years was 11.9 ( 95 % CI 10.9–12.9 ) . It was 16.4 ( 95 % CI 14.6–18.1 ) in girls and 7.7 ( 95 % CI 6.5–8.9 ) in boys . The peak incidence rate occurred in children aged 11–15 years . The prevalence of JIA per 100,000 persons was 44.7 ( 95 % CI 39.1–50.2 ) on December 31 , 2009 . Conclusion . The incidence rate of JIA observed in the Kaiser Permanente population , 1996–2009 , was similar to that reported in Rochester , Minnesota , USA , but 2 to 3 times higher than Canadian estimates
Results The literature review and meta- analysis identified decreased PA and increased time spent in SB in these population s , which may exacerbate both their lower physical fitness and the symptoms of their health disorders .
Background Physical activity ( PA ) is essential for children throughout their growth and maturation .
It improves physiological and psychological health and limits the risk of developing metabolic disorders .
However , some chronic physiological and metabolic diseases may lead to decreased PA .
The diversity of outcomes in the literature offers no consensus for physical activity and sedentary levels in children with juvenile idiopathic arthritis ( JIA ) or inflammatory bowel disease ( IBD ) .
The aim was to examine  PA and SB  in children with JIA or IBD compared to their healthy peers .