1.   The two groups were compared at hospital admission and at one year after their procedure.

2.   This was done by calculating mean deltas of UOS pressure for each subject and comparing group mean differences before and after the common cavity.

3.   The groups were compared by means of the Wilcoxon matched pairs signed rank test for paired data and the Mann-Whitney U test for unpaired data.

4.   When comparing the group of patients who had had a single attack with the control group, there was no significant difference in amylase secretion.

5.   We have therefore compared a group of coal miners and an age and sex matched group of subjects selected from the members of a general population screening study.

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

7.   The treatment groups were compared at baseline with respect to more than fifty characteristics.

8.   But a statistical analysis comparing a group of abused patients with a second group that had no history of abuse led to two results that she did not expect.