Table 5: Statistical characteristics for factors leading to defects occurrence in structural design of residential buildings.

No	Factors Leading to Defects Occurrence in Structural Design Stage of Residential Buildings.	Mean	Standard deviation	The Relative Weight (%)	The Value of the Test	P- Value	Rank
1-	Factors due to structural design	3.69	0.74	73.90	7.26	0.00	3
2-	Factors due to consultant firms administration and staff	4.01	0.74	80.27	10.50	0.00	1
3-	Factors due to drawings	3.98	0.92	79.58	8.20	0.00	2