Table 7. Group comparison of stability index. WBV Program Standard Program p-value Week 2 4.7 ± 2.3 (3.7-5.7) 5.4 ± 3.0 (4.1-6.7) .17 Week 5 4.0 ± 1.8 (3.2-4.8) 5.1 ± 2.4 (4.0-6.2) .07 Week 8 3.3 ± 1.5 (2.6-4.0) 4.9 ± 2.4 (3.9-6.0) .02 * Week 11 3.1 ± 1.3 (2.5-3.7) 4.7 ± 2.8 (3.5-5.9) .01 * The scale ranges from 0 to 10. Higher values indicate less postural stability. Data are presented as mean ± standard deviation (95% confidence interval). * p < 0.05 between WBV and standard program.