Although statistical analyses are now more widely carried out in medical research, many researchers use inappropriate statistical methods in their studies. Common mistakes found include: (1) Misuse of the p-value: apart from the problem of sample size, the meaning of the p-value could be misinterpreted if one does not understand the associated null hypothesis. It is also unacceptable to report a 2-tailed p-value for a l-sided a1ternative, or to use a single p-value for multiple conclusions. (2) Incompleteness: several statistical indexes are needed to justify reliability, as its definition is board. However, many researchers incorrectly use only a single coefficient, such as Cronbach'sα, to indicate that the entire instrument is reliable. (3) Even when appropriate statistical methods have been chosen, it is still possible that program codes are written incorrectly. (4) Some researchers are unaware of the fact that variables not significant in a simple linear regression may become significant if included in a multiple linear regression. (5) Others such as statistical methods used are inconsistent throughout the paper, and improper choice of statistical terms for interpretations. It is hoped that more attentions will be paid to the above-mentioned points during data analysis.