Sigmastat 3.5 for windows

Results are expressed as mean ± standard deviation. Statistical analysis was conducted with Student’s t-test or one-way analysis of variance, followed by the Kruskal–Wallis test, using SigmaStat 3.5 for Windows (Systat Software, Chicago, IL). Linear regression was performed to develop a model for the predicted weight percentage (wt%) of Ag based on the wear-out duration (hours). A P value of <0.05 was considered statistically significant.

A total of 45 propofol abusers (non-healthcare professionals) were asked to participate in a survey with the aid of the Namdong Police (Incheon, Korea) in order to secure an abuser list. The MFDS conducted this survey between October and December 2010.
Among the 45 abusers, 38 consented to publication of their information for scientific purposes. The demographics of these 38, non-healthcare professionals are detailed in Table 1. The questionnaire was subdivided into three parts as shown in the Appendix:

Part 1 dealt with the history of propofol abuse and was designed to obtain general information regarding an individual's history of propofol abuse;

Part 2 attempted to identify the problems caused by propofol abuse; the second part attempted to identify the social and economic problems caused by the abuse; and

Part 3 recorded the demographics of the interviewed abusers.

Statistical analysis was carried out using SigmaStat 3.5 for Windows (Systat Software, Inc., Chicago, IL, USA). The data are expressed as the mean (SD) for normally distributed continuous variables, the median (range) for abnormally distributed continuous variables, and the counts and percentages for the categorical variables.