Spss 15 j for windows

Statistical analysis was done with SPSS 15 J for Windows (SPSS, Chicago, IL, USA) to observe any significant differences. Data were presented as the mean (SD) for continuous variables with a normal distribution or median (interquartile range) for those with a skewed distribution. Student’s paired t test was used to compare preoperative BMD values and biochemical values with those obtained after surgery. To investigate the possible variables influencing BMD changes, both univariate Spearman’s correlation and stepwise multivariate linear regression analysis are used. We first used the univariate Spearman’s correlation to analysis the relationship between BMD changes and the clinical parameters. When the variables are highly correlated, stepwise regression models in which the choice of predictive variables is carried out by an automatic procedure were then used to choose the independent variables. Differences were considered significant when P value was less than 0.05.

Statistical analysis was done with SPSS 15 J for Windows (SPSS, Chicago, IL, USA) to observe any significant differences. All data is shown as the mean ± S.D., unless otherwise indicated. The relationship between the intact PTH levels and the weight, the volume, the maximum diameter of parathyroid glands were investigated by Spearman’s rank correlation coefficient. P-values <0.001 were considered significant.