Population by Year. World population from 5000 BC to 2016, with annual growth rate, yearly change, population density, and urban population. All people on 1 page. View the entire current world population on a single page, showing every single person one by one, increasing in real time.
To calculate your cholesterol ratio, divide your high-density lipoprotein (HDL, or good) cholesterol number into your total cholesterol number. An optimal ratio is less than 3.5-to-1. A higher ratio means a higher risk of heart disease.
Let me explain in general terms what the blood pressure numbers mean: top number (the systolic blood pressure) is the pressure the heart has to overcome to open the valves to pump blood out. Bottom number (the diastolic blood pressure) is the pressure between beats when the heart is resting.lood pressure is the pressure inside the arteries (blood vessels). It is measured in two numbers, such as 110/70 (110 over 70). Adults 18 years and older: 1  The first or top number (systolic pressure) is the highest pressure in the arteries when the heart pumps blood into them.