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Medical Definition of Black's formula
1. A translation of Pignet's formula into British measurements: F = (W + C) -H; F is the empirical factor, W is the weight in pounds, C the chest girth in inches at full inspiration, and H the height in inches; a man is classed as very strong when F is over 120, strong between 110 and 120, good 100 to 110, fair 90 to 100, weak 80 to 90, very weak under 80. (05 Mar 2000)