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1 Statistics Unit and Epidemiology Branch, Dental Health Center, Division of Dental Health, National Institutes of Health, Public Health Service, San Francisco, California 94118, USA
Five methods of allocating affected surfaces to extracted teeth were applied to incremental data from a clinical trial. Results were the same regardless of method used, but assigning the number of surfaces to the extraction as detected on the previous examination had the greatest flexibility and was judged preferable.
Submitted on October 3, 1969
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