Basically CTC got it right-- there are a lot of variables, and all 0-2-x\'s are not equal.
Which is why, in the pattern studies which should be available very soon (right, Mandown?), we break the horses out by age and time of year. It becomes tricky breaking it out by degree of top, development etc., because of sample size. But we hope to have the ability to address these issues in general terms soon.