A 58-year-old woman undergoes mammography screening and is found to have a 1.2-cm breast mass with negative axillary lymph nodes on imaging. Her vital signs are stable (BP 128/82, HR 72, RR 14, Temp 98.6°F, SpO2 98%). However, another woman in the same program develops symptomatic breast cancer between screening intervals with metastatic disease at diagnosis. Which bias best explains why screened tumors appear to have more favorable 10-year survival rates despite similar underlying disease biology?
- A)Berkson bias
- B)Length-time biasGABARITO
- C)Observer-expectancy bias
- D)Attrition bias
- E)Measurement bias
Explicação
Length-time bias occurs because screening is more likely to detect slowly progressive diseases that remain in a detectable preclinical phase for longer periods. Rapidly progressive tumors become symptomatic between screening intervals and are underrepresented ... Ver explicação completa e trilha adaptativa →