Rarely, proton pump inhibitors (such as omeprazole) have caused vitamin B-12 deficiency. The risk is increased if they are taken every day for a long time (3 years or longer). Tell your doctor right away if you develop symptoms of vitamin B-12 deficiency (such as unusual weakness, sore tongue, or numbness/tingling of the hands/feet).
Stability reliability refers to the consistency of students' scores when a test is administered to the same students on two different occasions. Alternate-form reliability describes the consistency of students' performances on two different (hopefully equivalent) versions of the same test.
To interpret any test score, a uniform frame of reference is required. Scale scores provide that frame of reference based on the standard adopted by the CCI of the amount of knowledge necessary to pass without regard to the specific test form or version taken. A scale score of at least 620 is required to pass.