Table 1 Attributes and levels

Cost(¥)

Out-of-pocket costs for participating in each screening; these not include transport, time off from work, and carer costs.

200 CNY

Each screening needs to pay 200 yuan RMB

400 CNY

Each screening needs to pay 400 yuan RMB

600 CNY

Each screening needs to pay 600 yuan RMB

Waiting time, hour

The time of waiting in line to participate in the screening after arriving at the screening institution.

1 h

The time to wait in line for screening is 1 h.

3 h

The time to wait in line for screening is 3 h.

5 h

The time to wait in line for screening is 5 h.

Pain

Is there pain or discomfort?

Severe

The pain is obvious and severe, which may be unbearable for you.

Mild

You may feel pain or discomfort.

None

You feel no pain or discomfort

Frequency

How often will the screening test be done?

Once a year

You will have the screening test every years.

Once every two years

You will have the screening test every 2 years.

Once every three years

You will have the screening test every 3 years.

Sensitivity

Is it accurate if you DO have cancer?

35%

If you DO have cancer, the test will miss it 65 out of 100 times

65%

If you DO have cancer, the test will miss it 35 out of 100 times

95%

If you DO have cancer, the test will miss it 5 out of 100 times