Risk Evaluation of Urban Integrated Pipe Corridor Operation and Maintenance Based on Improved AHP-CIM Model

Table 1

Two-by-two comparison of the “nine-scale method.”

Numerical values	Level of importance
1	Element i and element j are more important than equally
3	The i and j elements are slightly more important than the
5	Element i is more important than element j
7	The i element is much more important than the j element
9	Element i is significantly more important than element j
2, 4, 6, 8	The mutual importance of elements i and j lies between the two adjacent judgement scales above