Notice that in this case (as in many cases), population does not refer to people, but to bags of potato chips. To be concise, researchers often use symbols in place of words. Greek letters are usually used when referring to populations (the entire group being studied, from which a sample or samples will be drawn).
INR (international normalized ratio) tests are important in helping your healthcare provider determine your response to COUMADIN. INR tests check to see how fast your blood clots. The INR test is primarily used to monitor warfarin therapy, where the aim is to maintain an INR in target range. Your healthcare provider will decide what INR numbers are best for you and may adjust your dose of COUMADIN to keep your INR in your target range.
An INR range of 2.0 to 3.0 is generally an effective therapeutic range for people taking warfarin for disorders such as atrial fibrillation or a blood clot in the leg or lung. In certain situations, such as having a mechanical heart valve, you might need a slightly higher INR. When the INR is higher than the recommended range, it means that your blood clots more slowly than desired, and a lower INR means your blood clots more quickly than desired. What your results mean Clotting too slowly