NBME Answers : noname's page

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submitted by axsa19(9), visit this page

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AB is the only blood group that does not have preformed IgM antibodies in the plasma.

Blood group A has anti-B IgM

Blood group B has ani-A IgM

Blood group AB "NADA"

Blood group O has both anti-A & anti-B IgM

FA 2017 page 390

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axsa19 anti* +

noname FA 2018 page 400 +

vulcania FA 2019 p. 397 +1

destinyschild blood group O also has IgG, which is significant bc it can cross the placenta and cause hemolytic anemia in a fetus +4

submitted by stapes2big(16), visit this page

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I’m not sure about this one but the way I thought about it was that since the confidence interval included 1, it was not significant. And thus p value must be above 0.05

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tea-cats-biscuits That makes sense! +

asapdoc Had the same reasoning +24

jkan I get that it's not significant, but why is it 0.05<p<1 and not p>1.0 +12

jkan nvm, it's can't be greater than 1 because then it would have a negative% confidence interval which cannot happen (Think if p>0.05 means at least 95% within confidence interval) +12

charcot_bouchard p=0.05 means theres 5% chance null hypothesis is true. p=1 means theres 100% chance null hypothesis is true. >1 means >100% chance which isnt possible. +14

wowo p is a probability, so can't be greater than 1 +11

noname @charcot_bouchard, that is not a good interpretation of p-value. A better interpretation of p=0.05 would be: If in reality there is no increase in risk (RR=1), and if we replicated the same study of the same sample size many different times, then we would expect to find a risk ratio of (X) only about 5% of the time. +2