W​‌‍‍‍‌‍‍‌‌‍‍‍‌‍‍‍‍‌‍‍​hat are the characteristics of a good screening test? Examine the necessary factors to consider when implementing a screening instrument in a health clinic by ARNP. Discus​‌‍‍‍‌‍‍‌‌‍‍‍‌‍‍‍‍‌‍‍​s ways in which the predictive value of a screening test may vary according to the prevalence of disease. Formulate a scientific-based opinion on lead-time and length biases​‌‍‍‍‌‍‍‌‌‍‍‍‌‍‍‍‍‌‍‍​.