1.   The sample size for the little owl is small and the variable results for this species can probably be attributed to this.

2.   One reason for these variable results may relate to the differing degress of stringency applied to the diagnosis and confirmation of complete gall stone dissolution.

3.   Swabs of pharyngeal mucus give variable results and repeated sampling may be necessary.

4.   Paper tested by his company was not damaged, Williams said, but he added that the crash effort to sanitize so much mail could lead to variable results.

5.   Education Commissioner David Hespe warned that new tests will show variable results from year to year, especially when new standards are in place.