The Clinical Investigation of Disparity of Utility Values Associated with Gallstone Disease: A Pilot Study

Table 2

The distribution of utility values by time trade-off method for gallstone disease (𝑛=120).

Utility values	Number	(%)	𝜒^2-test for equal proportion
1.0	53	44.2
0.9–1.0	14	11.6
0.8–0.9	17	14.2	𝑃<0.001
0.7–0.8	14	11.7
<0.7	10	8.3
Unable to answer	12	10.0
Total	120	100.0
Mean ± SD* (𝑛=108); (95% CI)	0.89 ± 0.13; (0.87–0.91)
Mean ± SD** (𝑛=55); (95% CI)	0.78 ± 0.10; (0.75–0.81)

∗Excluded participants who were unable to answer how many years they would trade for being rid of gallstone disease.
∗∗Only calculated subjects who were willing to trade time of their life years to be rid of gallstone disease and cholecystectomy.