I did that test at 9:00 this morning on my MacBook Pro and scored 42. I figured that the monitor might not be accurate enough, so I waited until 4:00 this afternoon, and did the same test on my desktop iMac G5, where I scored a 16. Both monitors are colour calibrated, but months past their repeat dates.
I figure this test has a lot to do with the quality of the monitor.
David Buzzard