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.
Blood Pressure Numbers: What They Mean. Blood pressure numbers include systolic (sis-TOL-ik) and diastolic (di-a-STOL-ik) pressures. Systolic blood pressure is the pressure when the heart beats while pumping blood. Diastolic blood pressure is the pressure when the heart is at rest between beats. You will most often see blood pressure numbers written with the systolic number above or before the diastolic, such as 120/80 mmHg. The table below shows normal numbers for adults.