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What does an odds ratio of .75 mean?

"When you are interpreting an odds ratio (or any ratio for that matter), it is often helpful to look at how much it deviates from 1. So, for example, an odds ratio of 0.75 means that in one group the outcome is 25% less likely. An odds ratio of 1.33 means that in one group the outcome is 33% more likely."
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What does an odds ratio of .25 mean?

It is the ratio of the probability a thing will happen over the probability it won't. In the spades example, the probability of drawing a spade is 0.25. The probability of not drawing a spade is 1 – 0.25. So the odds is 0.25/0.75 or 1:3 (or 0.33 or 1/3 pronounced 1 to 3 odds).
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What does a negative odds ratio mean?

Positive odds ratios indicate that the event is more likely to occur, whilst negative odd ratios indicate the event is less likely to occur.
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Is an odds ratio of 1.2 high?

The magnitude of the odds ratio is called the “strength of the association.” The further away an odds ratio is from 1.0, the more likely it is that the relationship between the exposure and the disease is causal. For example, an odds ratio of 1.2 is above 1.0, but is not a strong association.
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What does it mean when odds ratio is less than 1?

An odds ratio of less than 1 implies the odds of the event happening in the exposed group are less than in the non-exposed group. An odds ratio of exactly 1 means the odds of the event happening are the exact same in the exposed versus the non-exposed group.
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NCCMT - URE - Odds Ratios

What does an odds ratio of 1.25 mean?

“For example, if the Odds Ratio was, for example, 1.25, it would mean that the fact of being a woman is a risk factor for cancer because for every 10 women without a tumor there would be 50 with it, while for every 10 healthy men there would be only 40 diseased”.
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How do I interpret odds ratio?

Odds of an event happening is defined as the likelihood that an event will occur, expressed as a proportion of the likelihood that the event will not occur. Therefore, if A is the probability of subjects affected and B is the probability of subjects not affected, then odds = A /B.
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What does relative risk of 0.75 mean?

2c) A risk ratio of 0.75 means there is an inverse association, i.e. there is a decreased risk for the health outcome among the exposed group when compared with the unexposed group. The exposed group has 0.75 times the risk of having the health outcome when compared with the unexposed group.
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What does a relative risk of 0.9 mean?

A risk ratio greater than 1.0 indicates an increased risk for the group in the numerator, usually the exposed group. A risk ratio less than 1.0 indicates a decreased risk for the exposed group, indicating that perhaps exposure actually protects against disease occurrence.
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What does a relative risk of 0.5 mean?

For example, when the RR is 2.0 the chance of a bad outcome is twice as likely to occur with the treatment as without it, whereas an RR of 0.5 means that the chance of a bad outcome is twice as likely to occur without the intervention. When the RR is exactly 1, the risk is unchanged.
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Is it better to have negative OR positive odds?

Negative numbers signify the favorite on the betting line. The negative number indicates how much you'd need to bet to win $100. If the number is positive, you're looking at the underdog, and the number refers to the amount of money you'll win if you bet $100.
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Is negative OR positive odds better?

What Does it Mean When Odds Are Positive? When odds are presented with a plus (+) sign in front of them, that signifies the underdog. Whereas negative (-) odds tell you what you have to bet on the favorite to win $100, positive (+) odds tell you how much you'll win for every $100 you wager on the underdog.
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Are minus odds good?

A "minus" (-) preceding the number indicates the team is a favorite. A "plus" (+) preceding the number indicates the team is an underdog. Bet Num. Note: The bottom team is always listed as the home team unless otherwise noted.
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What does odds ratio 1.5 mean?

An odds ratio of 1.5 means the odds of the outcome in group A happening are one and a half times the odds of the outcome happening in group B.
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What do odds of 1 to 5 mean?

What does 1 to 5 odds mean? 1-5 Betting Odds means that out of 6 potential outcomes, the 1/5 odds are that there will be 1 of one kind of outcome and 5 of another kind of outcome. The 1-5 odds calculation means for every 6 betting events your selection should win 5 times and on 1 occasion the selection will not win.
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What is a big odds ratio?

An odds ratio of 4 or more is pretty strong and not likely to be able to be explained away by some unmeasured variables. An odds ratio bigger than 2 and less than 4 is possibly important and should be looked at very carefully.
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What does a risk ratio of 0.8 mean?

A relative risk that is less than 1.0 indicates that there is a lower risk among the people in Group A. • If the relative risk were 0.8, people in Group A would be 20% less likely than people in all other groups to die from a cause.
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What does a relative risk of 0.6 mean?

Relative risk is an important and commonly used term. An RR of 1.00 means that the risk of the event is identical in the exposed and control samples. An RR that is less than 1.00 means that the risk is lower in the exposed sample. An RR that is greater than 1.00 means that the risk is increased in the exposed sample.
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What does a relative risk of 1.25 mean?

Example of a relative risk

This statistic is a relative risk (the relative risk is 1.25). It means inactive women are 25 percent more likely to develop breast cancer than women who exercise.
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What does a relative risk of 0.91 mean?

Relative risk is an important and commonly used term. An RR of 1.00 means that the risk of the event is identical in the exposed and control samples. An RR that is less than 1.00 means that the risk is lower in the exposed sample. An RR that is greater than 1.00 means that the risk is increased in the exposed sample.
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How do you interpret odds ratio and relative risk?

RELATIVE RISK AND ODDS RATIO

An RR (or OR) more than 1.0 indicates an increase in risk (or odds) among the exposed compared to the unexposed, whereas a RR (or OR) <1.0 indicates a decrease in risk (or odds) in the exposed group.
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What does a relative risk of 2.8 mean?

Thus the relative risk of seizure when taking the specific medication is 2.8 (2.8 = 0.16 / 0.057). A person is 2.8 times more likely to have a seizure when taking the specific medication, but that is only a 0.103% increase in absolute risk (1 in 1000 increase in absolute risk).
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Does odds ratio have to be greater than 1?

Definition in terms of group-wise odds

An odds ratio greater than 1 indicates that the condition or event is more likely to occur in the first group. And an odds ratio less than 1 indicates that the condition or event is less likely to occur in the first group. The odds ratio must be nonnegative if it is defined.
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What does an odds ratio of .98 mean?

The reported odd ratio of 0.98 at less than 1 indicates that for every additional parameter of the tested independent variable, they were . 98 times likely to report the likelihood of the test question. The p value of . 003 is statistically significant.
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How is the odds ratio for age interpreted?

For categorical predictors (e.g. age), the ORs represent the increase in odds of the outcome occurring, compared with the (arbitrarily) chosen reference group. For continuous predictors (e.g. age in years), the ORs would represent the increase in odds of the outcome occurring, for each unit increase in the predictor.
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