Table 2.

Statistical differences of the creep time constants between four samples. The numbers identified the four samples, which are ranked from highest to lowest time constant in each column. Differences were found for each model and holding time (Kruskal-Wallis test). Samples that are not statistically different from one another are marked by the same letter (p > 0.05, repeated Wilcoxon post-hoc tests), i.e. 3(A), 2(B) and 1(B C) means sample 3 was significantly different from 2 and 1 while 2 and 1 were similar. For all three models, the sample differences were the same for holding times greater than 16 s.

									Two Dashpot Kelvin
Model
	Standard Linear Solid				Burgers				Fast				Slow
Hold Time (s)	16	20	24	30	16	20	24	30	16	20	24	30	16	20	24	30
Rank Order	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)	3(A)
	2(B)	2(B)	2(B)	2(B)	1(B)	1(B)	1(B)	1(B)	1(B)	1(B)	1(B)	1(B)	2(B)	2(B)	2(B)	2(B)
	1(B C)	1(B C)	1(B C)	1(B C)	2(B)	2(B)	2(B)	2(B)	2(C)	2(C)	2(C)	2(C)	1(B)	1(B)	1(B)	1(B)
	4(C)	4(C)	4(C)	4(C)	4(C)	4(C)	4(C)	4(C)	4(C)	4(C)	4(C)	4(C)	4(B)	4(B)	4(B)	4(B)