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  #1  
Old 05-15-2011
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Stats What type of study is this?

An investigator is ascertaining the relationship between an environmental toxin and breast cancer. All the women with breast cancer are recognized in a particular zip code.
what is the term used for this?
1. point prevalence
2. period prevalence
3. Attack rate
4. Incidence
5. Cumulative incidence

please give an explanation too
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Old 05-15-2011
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1.point prevelance
2.period prevelance
3.Attack rate
4.incidence
5.cumulative incidence

This is a cross-sectional study = disease (all and new cases) and exposure status are measured simultaneously in a given population
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Old 05-15-2011
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well i dun kno the right answer but i marked point prevelance n it was wrong!..:S
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Old 05-15-2011
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i think point prevelence...wat is the rite answer?
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Old 05-15-2011
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Default Attack Rate

Quote:
Originally Posted by meka View Post
well i dun kno the right answer but i marked point prevelance n it was wrong!..:S
We can rule out period prevalence, incidence and cumulative incidence since they are all related to events over a certain time frame; this question is a cross-sectional study looking at one point in time.
I'm not sure why it wouldn't be point prevalence, but maybe it's attack rate.
According to Wikipedia:
"The term is defined as the number of exposed persons infected with the disease divided by the total number of exposed persons. It is measured from the beginning of an outbreak to the end of the outbreak. The term should probably not be described as a rate because its time dimension is uncertain. For this reason, it is often referred to as an attack ratio.
For instance, if there are 70 people taken ill out of 98 in an outbreak, the attack rate is about 71.4%.

Where did this question come from?
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Old 05-15-2011
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Quote:
Originally Posted by heights View Post
We can rule out period prevalence, incidence and cumulative incidence since they are all related to events over a certain time frame; this question is a cross-sectional study looking at one point in time.
I'm not sure why it wouldn't be point prevalence, but maybe it's attack rate.
According to Wikipedia:
"The term is defined as the number of exposed persons infected with the disease divided by the total number of exposed persons. It is measured from the beginning of an outbreak to the end of the outbreak. The term should probably not be described as a rate because its time dimension is uncertain. For this reason, it is often referred to as an attack ratio.
For instance, if there are 70 people taken ill out of 98 in an outbreak, the attack rate is about 71.4%.

Where did this question come from?
I think you´re right.
...with point prevalence, we are only talking about disease (we can´t link the exposure with the disease). THANKS!
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Old 05-17-2011
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but isnt attack rate for acute cases ? i mean cancer is kinda chronic process. n what about period prevalence, its kinda case control study, retrospective, n case control measures prevalence
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Old 05-17-2011
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Quote:
Originally Posted by meka View Post
An investigator is ascertaining the relationship between an environmental toxin and breast cancer. All the women with breast cancer are recognized in a particular zip code.
what is the term used for this?
1. point prevalence
2. period prevalence
3. Attack rate
4. Incidence
5. Cumulative incidence

please give an explanation too
Ideally, to know the effect of toxin in development of cancer, case-control study is required. I think question is not accurate-need more info!
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Old 05-18-2011
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i think it period prevalence.
because it can be cross sectional study as we collect data from different people as relate its occurence with certain risk factor.and as it is talking about a certain zip code..so i think its period prevalence
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