1.   The unpaired t test was used to compare the mean levels of diabetic control in two groups by means of a two sided test.

2.   The Mann-Whitney U test was used to compare data between patients and controls.

3.   The McNemar test was used to compare the incidence of failed peristalsis in patients before and after healing of oesophagitis.

4.   The Mann-Whitney U-test was used to compare results for different groups.

5.   The Kruskal-Wallis test and the Mann-Whitney U test were used to compare groups as appropriate.

6.   Bonds also were buoyed by expectations that Lehman Brothers and other securities firms will lengthen the durations of the indexes many investors use to compare their performance.

7.   Hardware prices keep falling, but PCs are still hard to use compared with a phone or TV.

8.   He was struck at how simple and elegant they were to use compared with high-end electronic calculators.