To examine the prevelance of autoimmune disorders and rheumatic manifestations in egyptian patients with inflammatory bowel diseases,and asses the relation between prevelance of autoimmune disorders ,rheumatic manifestations and disease activity of IBD

Inclusion Criteria:

• 1-adult patients with adiagnosis of IBD according to the validated criteria. 2-patients>18 years without aprevious diagnosis of SPA or other rheumatological manifestations.

Exclusion Criteria:

• 1- patients with active cancer or lymphoproliferative disease. 2-patients with uncontrolled diabetes. 3-patients with unstable ischeamic heart disease or congestive heart failure. 4-patients with acute renal failure. 5-patients already diagnosed with inflammatory or crystal induced arthropathies (including gout and calcium pyrophosphate dehydrate deposition disease) or other autoimmune diseases.

Cross-sectional studies are observational studies that analyze data from a population at a single point in time. They are often used to measure the prevalence of health outcomes, understand determinants of health, and describe features of a population. Unlike other types of observational studies, cross-sectional studies do not follow individuals up over time. They are usually inexpensive and easy to conduct. They are useful for establishing preliminary evidence in planning a future advanced study. This article reviews the essential characteristics, describes strengths and weaknesses, discusses methodological issues, and gives our recommendations on design and statistical analysis for cross-sectional studies in pulmonary and critical care medicine. A list of considerations for reviewers is also provided.