Vectors of Defects in Reinforced Concrete Structures in Onshore Oil and Gas Process Plants

Table 3

Multiple regression results N = 159.

	Unstandardized coefficients		Standardized coefficients	t		Collinearity statistics
	B	Standard error	Beta		Significant	Tolerance	VIF
(Constant)	3.157	0.986		3.200	0.002
EF (X1)	0.207	0.242	0.109	0.856	0.393	0.383	2.610
PF (X2)	0.088	0.155	−0.273	−2.253	0.026	0.426	2.348
MF (X3)	0.120	0.176	0.067	0.680	0.498	0.641	1.560
AF (X4)	−0.009	0.215	−0.005	−0.043	0.966	0.573	1.747
MF1 (X5)	−0.350	0.172	0.048	0.514	0.608	0.713	1.402
R square = 0.043	Adjusted R square 0.011			F change 1.359		Durbin–Watson 2.090

EF, environmental factors; PF, physical factors; MF, maintenance factors; AF, age factor; MF1, meteorological factors.