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To the Editor:— The format proposed by Rushmer ( 206 :836, 1968) for display of clinical laboratory data is an excellent one for those variables which are known to be approximately normally distributed. However, some variables may have a distribution which is far from normal. As Mainland 1,2 and others have pointed out, using the properties of the normal distribution when they do not obtain can result in misleading conclusions. Therefore, for any data which do not have a normal distribution, we suggest that a scale centered at the population median and graduated in percentile units would be more appropriate than a scale centered at the population mean and graduated in standard deviations.

Using the concept of a mixed g-monotone mapping, we prove some coupled coincidence and coupled common fixed point theorems for nonlinear contractive mappings in partially ordered complete quasi-metric spaces with a Q-function q. The presented theorems are generalizations of the recent coupled fixed point theorems due to Bhaskar and Lakshmikantham (2006), Lakshmikantham and Ciric (2009) and many others.