Open Access

Table 2

Mean, rank, t-test and significance of the respondents on GB site needs.

S/n Items Total sample Group 1 Group 2 t-cal Sig.



    Mean Rank Mean Rank Mean Rank    
21 Site assessment for contaminants 4.32 1 4.43 1 4.26 2a 1.19 0.24
22 Land recycling and redevelopment including brownfields, grayfield and blackfield 4.07 7 3.96 7 4.13 7 −1.06 0.29
23 Site repair and restoration 4.04 8a 4.13 4 4.00 11 0.74 0.46
24 Best green site practices e.g. avoiding compaction 3.73 15 3.46 15 3.87 14 −1.73 0.09
25 Restricting construction vehicle traffic driveways/accesses 3.90 13 3.74 12 3.99 12a −1.30 0.19
26 Integrating landscape areas against parking spaces 3.95 11 3.70 13 4.08 9a −2.12 0.04
27 Leveraging on natural environment in landscaping for controlled heating and cooling 4.13 4 3.91 9 4.24 4 −2.22 0.03
28 Orientating buildings for efficiency of the desired outcome (cold or heat) 4.19 3 4.22 2 4.18 5a 0.23 0.82
29 Site stormwater management 4.02 10 3.87 10 4.10 8 −1.26 0.21
30 Reusing and upgrading of old sites and buildings over greenfields 3.91 12 4.11 5 3.81 15 1.39 0.17
31 Reducing car dependence or sprawl to minimize pollution 4.04 8a 3.98 6 4.08 9a −0.55 0.58
32 Creating an accessible pedestrian walk and bicycle paths 4.29 2 4.15 3 4.36 1 −1.33 0.19
33 Topography management 4.10 5a 3.78 11 4.26 2a −2.82 0.01
34 Hydrology management 3.83 14 3.52 14 3.99 12a −2.26 0.03
35 Designating staging areas for materials 4.10 5a 3.93 8 4.18 5a −1.33 0.18
  Cluster value 4.04   3.93   4.10   −1.92 0.06

Note: Group 1 refers to lecturers, instructors, teachers and technologists teaching building construction and related trades in tertiary and secondary institutions. Group 2 refers to building industry workers such as engineers, architects, technicians, plumbers, etc with minimum of Senior Secondary certificate in building related trades. a = Equal ranks wherein the next rank is skipped; t-cal = Calculated t-value; Sig. = Level of significance at 0.05.

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