251109 rm-c.s.-assessing measurement quality in quantitative studies
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251109 rm-c.s.-assessing measurement quality in quantitative studies
- 1. Assessing Measurement quality in quantitative studies. Presented By: Mrs. Christy Simpson Professor, Maternity nursing
- 28. Urinary cotininie level Sensitivity = A/(A+C) = .50, Specificity = D/ (B+D) = .83 ( Percentage) Positive predictive value = A/(A+B) =.67 Negative predictive value =D/(C=D)=.71 Likelihood ratio –Positive (LR+) = Sensitivity/(1- Specificity) = 2.99 Likelihood ratio – Negative(LR_) = (1- sensitivity) / specificity =.60 LR Summarizes the relationship specificity and sensitivity in a single number. Self Reported smoking Positive Cotinine Negative Cotinine Total Yes , Smoked A (True positive) 20 B (False positive)10 A+B =30 No,Did not smoke C (False negative)20 D(True negative)50 C+D = 70 A+C=40 B+D=60 A+B+C+D 100