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All statistical analyses were performed by using the sas system, version 8.2 or higher (SAS Institute Inc., Cary, NC, USA).
All statistical analyses were carried out using SAS/STAT software, Version 9.2 of the SAS system for UNIX, and the results were graphed using SAS/GRAPH (SAS Institute, Cary, NC).
All statistical analyses for this paper were generated using SAS/STAT software, version 9.1 of the SAS system for Windows.
Statistical analysis was performed with the SAS system (SAS/STAT users guide, 1988).
The Statistical Analysis Systems (SAS®) software (version 9.2 of the SAS system for Windows. Copyright (c) 2002-2008 by SAS Institute Inc., Cary, NC, USA) and R software (version 2.11.1) [ 20] with the library FactoMineR [ 21] were used for data analyses.
The primary analysis (sequential test) was performed using the SAS software (SAS® software, version 9.2, for Windows (SAS Institute, Cary, NC, USA)).
Calculations were performed using the SAS software package (SAS™ Version 9.1., SAS Institute Inc., Cary, USA).
The statistical analyses were done using the SAS-Enterprise and SAS-JMP software.
The statistical analyses were performed using the SAS-program (SAS Inst. Inc., Cary, NC).
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