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#1
05-17-2012
 USMLE Forums Veteran Steps History: Not yet Posts: 205 Threads: 58 Thanked 19 Times in 16 Posts Reputation: 29
Epidemiology: How to calculate Incidence?

sometimes near exam we got stuck in stupid concepts we know since early studying

for incidence.
suppose we have population of 1000 and there are 200 patients have rheumatoid arthritis , this year we have 40 new cases with rheumatoid arthritis , so in this case what is the incidence ????

#2
05-17-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 1,406 Threads: 118 Thanked 642 Times in 407 Posts Reputation: 652

incidence is 40 new cases / the 800 people at risk of developing a new case

hence the incidence is 0.05
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"inflammable means flammable!? What a country."
 The above post was thanked by: mycoplasma (05-17-2012)
#3
05-17-2012
 USMLE Forums Addict Steps History: 1+CK+CS Posts: 187 Threads: 28 Thanked 101 Times in 56 Posts Reputation: 111

40/(1000-200)= 40/800
 The above post was thanked by: mycoplasma (05-17-2012)
#4
05-17-2012
 USMLE Forums Veteran Steps History: Not yet Posts: 205 Threads: 58 Thanked 19 Times in 16 Posts Reputation: 29

thanks alot

 Tags Biostatistics-Epidemiology

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