Table 4.

Marginal rates of substitution across all attributes

	Lung cancer patients					Colorectal cancer patients
	Time in a scanner	Time to diagnosis	Radiation dose	Number of additional scans	Accuracy	Time to diagnosis	Radiation dose	Number of additional scans	Accuracy
Numerator of MRS	Willingness to wait in scan (min)	Willingness to wait for diagnosis (weeks)	Willingness to have an additional 1/1000 cancer risk due to radiation exposure	Willingness to have an extra scan	Willingness for a 1% increase in accuracy	Willingness to wait for diagnosis (weeks)	Willingness to have an additional 1/1000 cancer risk due to radiation exposure	Willingness to have an extra scan	Willingness for a 1% increase in accuracy
Time in the scanner	–	− 0.02	− 0.02	− 0.05	0.08	NS	NS	NS	NS
Time to diagnosis	− 45.23	–	− 0.90	− 2.08	3.42	–	− 0.80	− 1.55	2.23
Radiation exposure	− 50.20	− 1.11	–	− 2.31	3.80	− 1.25	–	− 1.94	2.79
Number of additional scans	− 21.77	− 0.48	− 0.43	–	1.65	− 0.64	− 0.51	–	1.44
Accuracy	13.21	0.29	0.26	0.61	–	0.45	0.36	0.70	–

NS indicates that the coefficient on time in a scanner is non-significant so the MRS is not computed. The MRS for the willingness for time on the scanner for colorectal cancer patients is not reported because the coefficient on time in a scanner in this group is non-significant. The MRS with regards need for whole body and head to be in a scanner is not reported for either group because in both cases, the coefficient is non-significant