Table 2.

Question Items and Responsiveness for Lung Cancer Screening Measure.

Item	Item difficulty* (%)		Responsiveness** (%)	Percent Improvement† (%)**
	Pretest	Posttest
1. What percentage of lung cancer deaths are caused by smoking?	23.3	43.3	20.0	85.7
2. Where does lung cancer rank as a cause of cancer death in the US?	33.3	96.7	63.3	190.0
3. When to stop screening (at least 1 correct)	56.7	86.7	30.0	52.9
4. How many people with an abnormal CT scan will have lung cancer?	16.7	40.0	23.3	140.0
5. Can a CT scan suggest that you have lung cancer when you do not?	40.0	96.7	56.7	141.7
6. Can a CT scan miss a tumor in your lungs?	73.3	93.3	20.0	27.3
7. Will all tumors found in the lungs grow to be life threatening?	70.0	96.7	26.7	38.1
8. Without screening, is lung cancer often found at a later stage when cure is less likely?	83.3	96.7	13.4	16.0
9. How much does screening for lung cancer with a CT scan lower your chances of dying from lung cancer?	6.7	40.0	33.3	499.7
10. Can a CT scan find lung disease that is not cancer?	80.0	93.3	13.3	16.7
11. Can a CT scan find heart disease?	56.7	90.0	33.3	58.8
12. Is radiation exposure one of the harms of lung cancer screening?	33.3	90.0	56.7	170.0

^*Item Difficulty: Proportion of correct responses

^**Responsiveness (absolute) = (posttest percent correct score) – (pretest percent correct score)

^†Percent Improvement (relative) = (posttest correct score – pretest correct score)/(pretest correct score)*100