All statistical analyses were performed with SPSS for Windows
(version 15.0, SPSS Inc., 233 South Wacker Drive,11th Floor, Chicago,
IL, 60606-6307). The data were expressed as mean
standard
deviation. The Kolmogorov–Simirnov test was used for the
determination of the normal distribution. Independent-sample ttests
were used to compare the data for two randomized groups at
baseline. The paired t-testwas used to assess the difference between
the various pre-test and post-test values. Differences in the posttest
scores between the groups at the end of the 8-week
intervention were assessed by analysis of covariance, using the
pre-test results for both groups as the covariate. The level of
statistical significance for all tests for differences was set at p < 0.05.