A research paper indicates that 70% (n= 213) in the resolved group were correctly predicted and therefore n=91in the resolved group were not.Similarly 65% (n= 166) in the treated and persisted group were correctly predicted and therefore n= 90 in the treated and persisted group were not.Use these values and give a contextual explanation of sensitivity, specificity, positive predictive value and negative predictive value.

Read the paper "Management guidelines for women with normal colscopy after low grade cervical abnormalities: population study", by Teale et al (2000), BMJ, vol 320, pp 1693-1696. http://www.bmj.com/content/320/7251/1693.short