## Disease Detectives B/C

Nba2302
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### Re: Disease Detectives B/C

I am confused how to calculate attack rate and odds ratio. Should I use the 2*2 table with an equation like (a/c)/(b/d). or (Number of new cases of disease or injury during
specified period )/(Size of population at start of period)

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### Re: Disease Detectives B/C

Nba2302 wrote:I am confused how to calculate attack rate and odds ratio. Should I use the 2*2 table with an equation like (a/c)/(b/d). or (Number of new cases of disease or injury during
specified period )/(Size of population at start of period)
The first one is for odds ratio, and the second one is for attack rate.

Nba2302
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### Re: Disease Detectives B/C

Do you still need to learn about food borne illnesses this year

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### Re: Disease Detectives B/C

Nba2302 wrote:Do you still need to learn about food borne illnesses this year
It will be tested on significantly less this year (it's no longer a topic).

Nba2302
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### Re: Disease Detectives B/C

Why is attack rate listed on part 2, then incidence proportion is listed on part 3, even though attack rate and incidence proportion mean the same thing?

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### Re: Disease Detectives B/C

Nba2302 wrote:Why is attack rate listed on part 2, then incidence proportion is listed on part 3, even though attack rate and incidence proportion mean the same thing?
Probably the two parts were written at different times. Just ignore it.

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### Re: Disease Detectives B/C

So do you guys think we will need to know like McNemar's, Cochran-Mantel-haenszel, fischer's and such stuff? Or even chi square, or the test to see if odds ratio=1 etc? Because it seems like we really won't have to know much advanced statistics this year.
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### Re: Disease Detectives B/C

sophisSyo wrote:So do you guys think we will need to know like McNemar's, Cochran-Mantel-haenszel, fischer's and such stuff?
Probably not, but some event supervisors might put it on anyway, so you never know.

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### Re: Disease Detectives B/C

UTF-8 U+6211 U+662F wrote:
sophisSyo wrote:So do you guys think we will need to know like McNemar's, Cochran-Mantel-haenszel, fischer's and such stuff?
Probably not, but some event supervisors might put it on anyway, so you never know.
I've definitely seen Cochran-Mantel-Haenszel on a test before. I think I've seen Fischer's as well, but I don't remember for sure.
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### Re: Disease Detectives B/C What's new?

nmsciencemom wrote:I noticed on this year's event description, the section about C level doing advanced statistics is gone, replaced by a requirement they do more on confounding, biases and prevention measures. Does this mean we can stop trying to teach college statistics?!! Probably will be more clear on the new DD CD from Nationals.
They are also are trying to allocate the test emphasis more evenly on Background and Surveillance, Outbreak Investigation and Patterns, Controls and Prevention. If only our state event supervisor would take note of the changes...
Also new, the "5 step Process for Surveillance and the types of Surveillance".

And most importantly, this would normally be the year that the topic would be environmental sources of disease, but there is no mention of a special area to focus on this year under the Description paragraph. Anyone know if we are moving away from doing topics?!
What even is the 5 step process for surveillance? I can't find it anywhere on the internet.

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