Epidemiology/Introduction

Block 1: Epidemiology

EPI.3-1: MEASURES OF EFFECT OR MEASURES OF COMPARISON OF DISEASE OCCURRENCE

SESSION OBJECTIVE

At the end of this session you should understand the meaning of the word "effect" as distinct from a health outcome, how measures of effect are based on measures of occurrence, and how and when effect measures are calculated.

In comparisons of disease occurrence, the occurrence of disease is measured and compared between two groups. Typically one of these groups is exposed to some determinant of disease while the other is not.

The occurence of a disease is measured in three different ways:

Prevalence;
Incidence Proportion;
Incidence Rate.

General Introduction to Occupational Health: Occupational Hygiene, Epidemiology & Biostatistics by Prof Jonny Myers is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 South Africa License.