<prompt> High sensitivity in a study meansIf the disease is rare, then it means that patient is definitely having it.High chance of having a disease if the prevalence is highHigh chance of definitely having the diseaseHigh chance of not getting the disease.  <response>: ANS. B Sensitivity: AAC x 100Sensitivity is the probability that a test will indicate disease among those with the disease. Specificity: DDB x 100Specificity is the fraction of those without disease who will have a negative test result. Positive Predictive Value: AAB x 100Positive predictive value--diagnostic power of a screening test to correctly identify the disease. Negative Predictive Value: DDC x 100Negative predictive value--diagnostic power of a screening test to exclude the disease. Important formulas in SPM1. Extra edge in sensitivity, specificityIn sequential testing one diagnostic test is done, if that test is positive, same test is repeated again:- False positivity decreases- Specificity increases- Sensitivity decreasesIn parallel testing two different diagnostic tests are done together:- False negativity decreases- Sensitivity increases- Specificity decreasesThis question was asked in May and November session JIPMER 20172. Normal distribution curve3. Positive and negative skew In positive skew: Mean Median Mode In negative skew: Mean Median Mode4. Odds ratio Pl-P where, P is the probablity.5. Sample size of a study 4PQD2 where, P prevalence, Q 1-P, D is error6. Standard error of a population? PQsample size7. Crude birth rate 8 x total fertility rate 1. 