RESNA 27th International Annual Confence
Figure 1 describes the VDV recorded for each surface, for both years. Surface 1 (brushed concrete—standard sidewalk; year 1: 10.34 +/- 2.03, year 2: 8.55 +/- 1.33) has higher VDV than all other surfaces except Surface 4, and had a significantly lower VDV in the second year than in the first. Surface 2 (interlocking pavement in a 90-degree herringbone pattern with square edges; year 1: 6.33 +/- 0.95, year 2: 6.65 +/- 0.74) had significantly lower VDV than all other surfaces at both time points. Surface 3 (interlocking pavement in a 90-degree herringbone pattern with 3.2 mm beveled edges; year 1: 7.71 +/- 1.95, year 2: 7.35 +/- 0.81) had relatively low VDV and did not change significantly from the first to second year. Surface 4 (interlocking pavement in a 90-degree herringbone pattern with 6.4 mm beveled edges; year 1: 14.69 +/- 2.05, year 2: 12.16 +/- 1.39) had significantly higher VDV than all other surfaces, and had significantly lower VDV in the second year. Surface 5 (fired brick clay 45-degree herringbone pattern with square edges; year 1: 8.57 +/- 1.55, year 2: 8.07 +/- 1.49) VDV did not change significantly from the first to second year, but variability appears to be higher in the first year. Surface 6 (fired brick clay 45-degree herringbone pattern with 3.2 mm beveled edges; year 1: 8.29 +/- 1.35, year 2: 7.98 +/- 1.08) had relatively low VDV and did not change significantly from the first to second year.