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.
The percentile score shows how many people who sat the same test scored less than you. For example if your percentile score is at the 66th percentile, 66% of the people who sat the tests scored less than you. Your number of correct answers is compared to the benchmark for a cohort in the same industry at the same level.