Relationship between risk information on total colonoscopy and patient preferences for colorectal cancer screening options: Analysis using the Analytic Hierarchy Process

Table 2 Results of comparison between FOBT and TCS (aggregated weights and priorities)

Criterion	Group A				Group B
	Global priority	Local priority	FOBT weight	TCS weight	Global priority	Local priority	FOBT weight	TCS weight
Major criteria
Effectiveness		0.603	0.220	0.780		0.652	0.202	0.798
Costs		0.147	0.830	0.170		0.149	0.839	0.161
Avoid disadvantages		0.250	0.501	0.499		0.199	0.455	0.545
Subcriteria of 'effectiveness'
Mortality reduction rates	0.393	0.652	0.237	0.763	0.471	0.723	0.225	0.775
Detection rates	0.210	0.348	0.187	0.813	0.181	0.277	0.192	0.808
Subcriteria of 'costs'
Time cost	0.071	0.482	0.828	0.172	0.071	0.479	0.817	0.183
Out-of-pocket payment	0.076	0.518	0.832	0.168	0.078	0.521	0.832	0.168
Subcriteria of 'avoid disadvantages'
Complications	0.163	0.650	0.670	0.330	0.092	0.461	0.790	0.210
False positives/negatives	0.088	0.250	0.185	0.815	0.107	0.539	0.168	0.832
Subcriteria of 'avoid false positives/negatives'
False positives	0.062	0.706	0.186	0.814	0.076	0.711	0.180	0.820
False negatives	0.026	0.294	0.182	0.818	0.031	0.289	0.177	0.823

Global priority of each subcriterion = local priority of each subcriterion * priority of the parent criterion. e.g., global priority of mortality reduction rates in Group A = 0.652*0.603 = 0.393.
Weight of the parent criterion is the sum of (weight * local priority) of each subcriterion. e.g., FOBT weight of effectiveness in Group A = 0.237*0.652+0.187*0.348 = 0.220.
Overall priority is the sum of (weight * local priority) of each major criterion.
Overall priority of FOBT in Group A = 0.220*0.603+0.830*0.147+0.501*0.250 = 0.380.
Overall priority of TCS in Group A = 0.780*0.603+0.170*0.147+0.499*0.250= 0.620.
Overall priority of FOBT in Group B = 0.202*0.652+0.839*0.149+0.455*0.199= 0.348.
Overall priority of TCS in Group B = 0.798*0.652+0.161*0.149+0.545*0.199 = 0.652.

ISSN: 1472-6963