Disease Detectives B/C

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Re: Disease Detectives B/C

Post by Flavorflav »

UTF-8 U+6211 U+662F wrote:Breast Cancer and Calcium Tablets:
                     Cases            Controls
Exposed           70                  25
Unexposed       30                  75

Odds of exposure of cases = 70/30 = 2.3
Odds of exposure of non-cases = 25/75 = .33
Odds Ratio = Odds of exposure of cases/Odds of exposure of non-cases= 2.3/.33 = 6.97
The odds of exposure to calcium tablets of cases-patients was 6.97 times those of controls, therefore, case-patients were 5.97 times more likely to have used calcium tablets than controls (not sure how accurate that is).

Odds ratio = OR = ad/bc, calculates correlation, not direct causation (I'm not trying to criticize anyone here).
Relative risk = RR = AR for exposed/AR for unexposed = [a/(a+b)]/[c/(c+d)], measures the relative risk of a specific exposure

Hope that helped!
Exactly right on the odds ratio, but another caution: you can't go from odds ratio to "times more likely" as easily as you can with risk ratio. Remember that if you do odds ratio on the roll of two dice, where one or two count as hits for the first but only one is a hit for the second, your odds ratio will actually be 2.5 (2:4 over 1:5). In reality, though, the event is only twice as likely, not 2.5 times as likely.
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Re: Disease Detectives B/C

Post by asun48 »

I've only done disease detectives one year, and i'm wondering what I should know about certain types of pathogens and what diseases I should put on my cheatsheet. Thanks
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Re: Disease Detectives B/C

Post by UTF-8 U+6211 U+662F »

You should do representatives for each group of illnesses.
Food-borne: Salmonellosis, E. coli infections, etc.
Water-borne: Giardiasis, Cholera, etc.
Airborne: Tuberculosis, Measles, etc.
Sexual: Hepatitis, Herpes, Cervical Cancers, etc.
Mosquito-borne: Malaria, Yellow Fever, etc.
Tick-borne: Lyme disease, etc.
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Re: Disease Detectives B/C

Post by SOnerd »

UTF-8 U+6211 U+662F wrote:You should do representatives for each group of illnesses.
Food-borne: Salmonellosis, E. coli infections, etc.
Water-borne: Giardiasis, Cholera, etc.
Airborne: Tuberculosis, Measles, etc.
Sexual: Hepatitis, Herpes, Cervical Cancers, etc.
Mosquito-borne: Malaria, Yellow Fever, etc.
Tick-borne: Lyme disease, etc.
Is there a good place where I could find (somewhat) comprehensive lists of each type? I've found one for foodbourne on the CDC website, but idk if it's accurate.
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Re: Disease Detectives B/C

Post by UTF-8 U+6211 U+662F »

SOnerd wrote:
UTF-8 U+6211 U+662F wrote:You should do representatives for each group of illnesses.
Food-borne: Salmonellosis, E. coli infections, etc.
Water-borne: Giardiasis, Cholera, etc.
Airborne: Tuberculosis, Measles, etc.
Sexual: Hepatitis, Herpes, Cervical Cancers, etc.
Mosquito-borne: Malaria, Yellow Fever, etc.
Tick-borne: Lyme disease, etc.
Is there a good place where I could find (somewhat) comprehensive lists of each type? I've found one for foodbourne on the CDC website, but idk if it's accurate.
Sample tests would be great places. Start on the test exchange and e x  p   a     n        d. <--Fibonacci Spaces!!! ;) :geek:
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Re: Disease Detectives B/C

Post by UTF-8 U+6211 U+662F »

Flavorflav wrote:
UTF-8 U+6211 U+662F wrote:Breast Cancer and Calcium Tablets:
Cases Controls
Exposed 70 25
Unexposed 30 75

Odds of exposure of cases = 70/30 = 2.3
Odds of exposure of non-cases = 25/75 = .33
Odds Ratio = Odds of exposure of cases/Odds of exposure of non-cases= 2.3/.33 = 6.97
The odds of exposure to calcium tablets of cases-patients was 6.97 times those of controls, therefore, cases were highly associated with calcium tablets.

Odds ratio = OR = ad/bc, calculates correlation, not direct causation (I'm not trying to criticize anyone here).
Relative risk = RR = AR for exposed/AR for unexposed = [a/(a+b)]/[c/(c+d)], measures the relative risk of a specific exposure

Hope that helped!
Exactly right on the odds ratio, but another caution: you can't go from odds ratio to "times more likely" as easily as you can with risk ratio. Remember that if you do odds ratio on the roll of two dice, where one or two count as hits for the first but only one is a hit for the second, your odds ratio will actually be 2.5 (2:4 over 1:5). In reality, though, the event is only twice as likely, not 2.5 times as likely.
EDIT: Oops! Haha! That's supposed to be times more likely. Happy now?
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Re: Disease Detectives B/C

Post by mnstrviola »

Hey Division C'ers, are you guys putting z and t tables on your sheet? Or would the event supervisor provide those if needed?
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Re: Disease Detectives B/C

Post by fozendog »

mnstrviola wrote:Hey Division C'ers, are you guys putting z and t tables on your sheet? Or would the event supervisor provide those if needed?
My guess is they would provide them if needed....
I would memorize the important Z ones, like 1.96 for 95%, but T is hard because of the different DFs.
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Re: Disease Detectives B/C

Post by SOnerd »

Hey Guys, a few more questions about modes of transmissions.
I'm making a list with each mode of transmission on my notes, and listing diseases under each. What are all the "categories" I should have?
So far, there is: Food-Bourne, Water-Bourne, Airborne, Sexual, Mosquito-Borne, Tick-Borne, and Droplet.
With Direct and Indirect contact, are there certain modes of transmission (listed above ^) that are 'sub categories' of indirect and direct contact? For example, would all STDs be considered direct contact, all food/water borne be considered indirect?

Thanks :D

EDIT- Also, what mode of transmission would Athlete's Foot fall under?
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"No one can truly be called an entomologist , sir; the subject is too vast for any single human intelligence to grasp". -OW Holmes

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Re: Disease Detectives B/C

Post by UTF-8 U+6211 U+662F »

SOnerd wrote:Hey Guys, a few more questions about modes of transmissions.
I'm making a list with each mode of transmission on my notes, and listing diseases under each. What are all the "categories" I should have?
So far, there is: Food-Bourne, Water-Bourne, Airborne, Sexual, Mosquito-Borne, Tick-Borne, and Droplet.
With Direct and Indirect contact, are there certain modes of transmission (listed above ^) that are 'sub categories' of indirect and direct contact? For example, would all STDs be considered direct contact, all food/water borne be considered indirect?

Thanks :D

EDIT- Also, what mode of transmission would Athlete's Foot fall under?
Athlete's foot: Direct Contact, Fomites, etc.

Food-Borne + Water-Borne = via a medium

Mosquito-Borne + Tick-Borne = Vector Transmission

Please Google:
Direct transmission,
Indirect transmission
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