Machine Learning and Statistical Test–Based Culvert Condition Impact Factor Analysis

Table 5

Summary of p Values from the Mann–Whitney U test.

Material	Variable	Condition rating
		MC	CA	SOJ	SC
Concrete	Age	0.001	0.001	0.001	0.001
	Span	0.001	0.001	0.001	0.001
	Rise	0.001	0.001	0.001	0.001
	Cover height	0.001	0.131	0.213	0.003
	pH	0.001	0.001	0.001	0.001
Corrugated metal	Age	0.001	0.001	0.001	0.009
	Span	0.007	0.885	0.001	0.002
	Rise	0.085	0.99	0.002	0.001
	Cover height	0.117	0.002	0.001	0.001
	pH	0.001	0.001	0.001	0.001
Corrugated plastic	Age	0.001	0.001	0.001	0.001
	Span	0.883	0.001	0.109	0.001
	Rise	0.788	0.001	0.127	0.001
	Cover height	0.072	0.37	0.001	0.001
	pH	0.445	0.294	0.213	0.001
Vitrified clay	Age	0.75	0.245	0.249	0.597
	Span	0.194	0.083	0.114	0.142
	Rise	0.217	0.096	0.12	0.128
	Cover height	0.006	0.043	0.822	0.001
	pH	0.002	0.008	0.001	0.001