The AB Design can be used to quickly assess the effects of an experimental variable. Its main disadvantage its inability to distinguish the experimental effect from possible confounds that might occur coincident with the change of condition.
ceÂ·liÂ·ac disÂ·ease. A disease occurring in children and adults characterized by sensitivity to gluten, with chronic inflammation and atrophy of the mucosa of the upper small intestine; manifestations include diarrhea, malabsorption, steatorrhea, and nutritional and vitamin deficiencies.
Gluten is a protein found naturally in wheat, rye, and barley. Gluten intolerance is an adverse reaction to gluten. Symptoms of gluten intolerance may be varied and come on slowly over a period of time, thus making it hard to pinpoint, like many food intolerances.