In our setting, all patients identified with VAP or CLABSI through the trigger screening were also identified through traditional screening (positive predictive value: 100%); all patients with no VAP or CLABSI in trigger screening were also identified as such through traditional screening (specificity: 100%), as a reference gold standard.
No GP recorded 100% specificity in the pre test, whilst 7 (41%) recorded 100% screening specificity following the intervention.
In the post test, four GPs (23%) rated a screening specificity of less than 50%, six (35%) achieved a specificity of 66%, and seven (41%100%0% specificity.
In the pre test, nine GPs (54%) recorded a screening specificity of less than 50%, four (23%) a specificity of 50% and four (23%) a specificity of 75%.
In the pre-test, thirteen (76%) GPs achieved a screening specificity of less than or equal to 50%, and four (23%) a specificity of 75%%.
Modifications to the delivery process were implemented for Phase II in an attempt to recruit more high-risk individuals and to improve screening specificity.
Likewise, the negative predictive value of a screening mammogram is a proportion that equals the TN cases/1000 screens (specificity times [1-prevalence]), divided by the sum of the negative cases/1000 screens.
A three-tiered approach was employed consisting of screening, specificity testing using unconjugated rHuPH20 as a competitor, and two-fold step-wise titering in negative base pool plasma diluted 1 5.
The mammography plus MRI strategy of the model differs from the mammography alone strategy in four key ways: the cost of MRI screening, increased screening sensitivity, a more favourable stage distribution among MRI-detected cancers, and more false positive screens due to decreased screening specificity.
In population-based screening, specificity is of utmost importance, as it basically determines the costs of the programme and the amount of unwanted adverse effects (anxiety, repetitive and confirmatory tests, as well as unnecessary colposcopy referrals and treatments) in the generally healthy population.
