Magnitude of Construction Cost and Schedule Overruns in Public Work Projects

Table 9

Post hoc analysis for construction cost and schedule overruns by project size.

Project size	Less than $1 M		$1 M to < $5 M		Greater than $5 M
	Mean difference	𝑃 value	Mean difference	𝑃 value	Mean difference	𝑃 value
Construction cost overrun
Less than $1 million	—	—	1.88	0.054	2.26	0.026*
$1–$5 million	1.88	0.054	—	—	0.38	0.902
Greater than $5 million	2.26	0.026*	0.38	0.902	—	—
Construction schedule overrun
Less than $1 million	—	—	16.23	0.001**	25.59	<0.001**
$1–$5 million	16.23	0.001**	—	—	9.36	0.109
Greater than $5 million	25.59	<0.001**	9.36	0.109	—	—

∗Statistically significant at alpha level 0.05.
∗∗Statistically significant at alpha level 0.01.