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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: Saf Sci. 2002 Nov 1;40(7-8):689–703. doi: 10.1016/S0925-7535(01)00067-4

Table 3.

Wilcoxon signed ranks test on each of the floor surfaces (observed vs. expected) between young and the elderlya

Floor types Young
 Elderly
n T+ p n T+ P
Ceramic 3 3 0.625 19 173.5 0.0001*
Steel 5 15 0.030 18 170.0 0.0001*
Oily plywood 2 2 >0.625 17 91.0 0.0062*
Oily vinyl 3 6 0.125 7 28.0 0.0078*
a

where, n, number of ranked trials excluding no differences among observed and expected PSRS rating; T+−, sum of fewest differences between observed and expected PSRS ratings; P, critical values of T+ for the Wilcoxon signed ranks test.

*

Significant difference at α≤0.01.