Innumerable history and examination forms have been used to record a single hearing test, and a few charts have been published with columns for four or five tests, but apparently in the past hearing tests have been used more for diagnosis than for recording the effect of treatment. From the time I first began to make use of hearing tests a need was felt for some means of recording not only the initial test but subsequent tests as well.
For several years a card was used with a column for each examination, dated across the top and a list of tests extending down the page on the left hand side. This was found to be a great help, but when treatment was prolonged over a long period, comparison of the various tests which had been made required laborious reviewing of the recorded numbers. This was found to be confusing. In
BLACKMAR FB. A CHART FOR REPEATED FUNCTIONAL HEARING TESTS. Arch Otolaryngol. 1929;10(5):516–518. doi:10.1001/archotol.1929.00620080080007
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