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–Effective January 1973, the present policy for AMA scientific publications for use of a mixture of metric and nonmetric measurements will change; the 11 journals thereafter will publish measurements only in a modified metric system (as described in Vawter SM, DeForest RE: The international metric system and medicine. JAMA 218:723-726, 1971).
Some suggestions on "getting set" for the change in policy were contained in a letter received from Richard J. Noveroske, MD, Evansville, Ind:
The best way to go metric is to think metric without conversion. . . . Precise conversions to decimal places of values that are only estimates in US customary involve the old maxim in mathematics about trying to have more significant figures in the "answer" than are present in "what is given." For the usual estimation or judging one can think of a meter being a large yard, a liter a large quart, and a kilogram a
Metrication: Think Metric. Arch Gen Psychiatry. 1972;26(3):228. doi:10.1001/archpsyc.1972.01750210036007