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.
Performance at the 25th percentile, for example, indicates a standardised score that is as good as, or better than, the standardised scores of 25 per cent of the sample. This information may be useful when, for example, reporting school test scores to parents.here is, in fact, a fixed relationship between standardised scores and percentile ranks when the same average score and standard deviation are used. The table below shows the relationship for tests that employ an average standardised score of 100 and a standard deviation of 15.