Abstract
The author shows that unequal excursion of the two leaves of the diaphragm is a normal finding. Left dominance is twice as common as right dominance and the mean left excursion is greater than the mean right excursion. This inequality is obvious without measurement in one out of six normal subjects. Unilateral paradoxical movement on sniffing occurs in 6% of normal subjects and the sniff test is unreliable unless suitably qualified or supported. The chances of a normal subject showing diminished excursion plus a paradoxical sniff test on the same side, are 2% on the right side and 0.12% on the left side.
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