It was assumed that a P value of less than 0.05 was statistically
significant, with a P value between 0.05 and 0.10 being indicative
of a tendency toward significance. For the statistical test performed,
10 practices were identified in which the P value was less than 0.05.
Of the 22 practices that were implemented on all projects, no assessment
could be made about their effectiveness in influencing the
RIR, as there was no sample population for comparison in cases in
which the practices were not implemented. The results are shown in
Table 4.