Shared Flashcard Set

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USMLE step 1 Behavior Science & stats
USMLE step 1 Behavior Science & stats
26
Medical
Graduate
05/14/2011

Additional Medical Flashcards

 


 

Cards

Term

Drug trials phases I, II, III, and IV measure what? for each

Definition

I = safety, toxicity, pharmakinetics

II = dosing, efficacy, side effects

III = compares to current Tx

IV = after approval by FDA measures long term adverse effects

Term

Sensitivity formula

Definition

True pos /(true pos + false neg)

Term

Specificity formula

Definition

True neg / (true neg + false pos)

Term

pos predictive value formula

Definition

true pos / (true pos + false pos)

 

**whole formula is of Positives

Term

neg predictive value formula

Definition

True neg / (true neg + false neg)

 

** whole formula is of negatives

Term
what does odds ratio measure or tell you about a study?
Definition

the odds of having DZ in exposed group divided by odds having the same DZ in a non-exposed group.

Is from a retrospective case-control study.

Term
what does relative risk measure / mean about a study?
Definition

is the relative probablility of getting a DZ in the exposed group compared to the unexposed group.  

(% w/ dz in exposed group) / (% w/ DZ in unexposed) = RR

Is in a prospective cohort study

Term
selection bias
Definition
poor group assignment
Term
recall bias
Definition
subject's recall is changed by them knowing if they have the disorder
Term
confounding bias
Definition
the effect of one factor distorts / confuses the effect of another factor
Term
Lead-time bias
Definition
detection of the DZ early is confused with an extended survival
Term
Pygmalion effect
Definition

researchers' belief in the Tx changes the outcome

-like self fulfilling prophecy

Term
Hawthorne effect
Definition
group being studied knows they're being watched, so they change their behavior
Term
Type I error
Definition
like a false positive - states that there is an effect or difference when none exists
Term
Type II error
Definition

like false negative

reports there is no effect / difference, when there is a difference

Term
As sample size (n) increases what happens to the SEM (standard error of the mean), and what happens to the standard deviation?
Definition

Standard error of the mean gets smaller

Standard deviation stays the same

Term

1) t-test

2) ANOVA

3) χ2 tests

What does each compare

Definition

1) the difference b/w two means

2) diff b/w the means of 3 or more groups

3) diff b/w 2 or more percentages or proportions of categorical outcomes

Term
medicare vs medicaid - who gets which?
Definition

medicarE is Elderly

 

medicaiD is Destitute/ low income

Term
medicare parts A, B, C, D - what do they cover?
Definition

A is inpatient hospital/nursing/hospice

B is outpatient / PT

C is combo in/out pt (A&B)

D is drug perscription

Term
APGAR stands for?
Definition

points (0,1,2)

Appearance (blue, pink trunk, all pink)

Pulse (0, <100, >100)

Grimace (none, grimace, grimace & cough)

Activity (limp, some, active)

Respiration (none, irregular, regular)

Term
APGAR stands for?
Definition

points (0,1,2)

Appearance (blue, pink trunk, all pink)

Pulse (0, <100, >100)

Grimace (none, grimace, grimace & cough)

Activity (limp, some, active)

Respiration (none, irregular, regular)

Term
Sleep stages with EEG characteristics
Definition

Beta (0) - awake, highest freq lowest amp

Alpha (1)- higher amp spikes, lower freq

Theta (2)- Sleep spindles, K complex

Delta (3&4)- lowest freq, highest amp spikes.  night terrors, sleep walk, bed wet

Beta (REM)- high freq low amp again, dreaming, erection, increased brain oxygen use, ACh is main neurotransmit. Happens every 90 min.

Term
sleep changes of depression
Definition

*early morning awakening* - impt screen

less slow wave, more and earlier REM

night awakening

Term
at what stage do people pee the bed or sleep walk?
Definition
Delta, stages 3&4
Term
at what sleep stage does the heart rate increase and why?
Definition
Beta REM stage, heart rate is up because the brain increases oxygen use.
Term
what stage of sleep do night terrors happen?
Definition
Delta stages 3&4
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