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Chapter 1 A Pocket-Size Introduction. I Chapter 2 The Big Picture - With Examples 3 Chapter 3 How to Set Things Up? Study Designs 21 Clhapter 4 How Often does it Happen? Disease Frequency 43 Chapter5 What's the Answer? Measures of Effect. 71 Chapter 6 What is the Public Health Impact? . 91 Chapter 7 Is There Something Wrong? Validity & Bias 109 Chapter 8 Were Subjects Chosen Badly? Selection Bias 127 Chapter 9 Are the Data Correct? Information Bias 139 Chapter 10 Other actors Accounted For? Confounding Interaction 161 Chapter 11 Confoundling can be Counfounding Several Risk Factors 179 Chapter 12 Simple Analyses 2x2 Tables are Not That Simple . . . 191 Chaptr 13 Control What it's All About . . 227 Chapter 14 How to Deal with Lots of Tables - Stratified Analysis 245 Chapter 15 Matching - Seems Easy but not That Easy. 257