Data from a case-control study of the relationship between oral contraceptive use and ovarian cancer shows: Ages 20-39 Ocs Ages 40-49 Ages 50-59 Non OCs Os Non OCs Os Non OCs Case 46 12 30 30 17 44 Control 285 51 463 301 211 331 Answer these questions: a. What is the crude odds ratio? b. What is the odds ratio for ages 20-39? c. What is the odds ratio for ages 40-49? d. What is the odds ratio for ages 50-59? e. What is the overall odds ratio adjusted for age? f. What is the evidence for confounding?
Percentage
A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.
Algebraic Expressions
In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.
Numbers
Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.
Subtraction
Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.
Addition
Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.
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