Hi Buckeye and hlsmith,

Thank you for your supportive replies. Sadly I am not permitted to post their graph at this time. I have attached a very similar graph. The Y axis has straightforward raw data plotted. The X axis has the z-scores of the other variable plotted on a scale from -2 standard deviations through zero to +2 SD. To answer your question, yes, the authors state this variable is standardised. Ten data points fall within the confidence intervals lines for the regression line, thirteen outside. The image I have attached is very similar in the spread of data.

The results section consists of two sentences. The first states multiple regression was used to evaluate the association between X and Y. The second gives the results showing a statistically significant positive relationship between X and Y values and that other factors did not contribute to the equation. I have no problem with the use of scatter plots with the regression line and confidence intervals. What I query is plotting the z-scores without explanation in the text or in the legend that accompanies the graph.

I really appreciate your time in considering this. I look forward to your advice.

Nayo