{'fraction_non_alphanumeric': 0.023688663282571912, 'fraction_numerical': 0.024534686971235193, 'mean_word_length': 4.6875, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Apparent changes in cancer mortality, 1968. A study of the effects of the introduction of the Eighth Revision International Classification of Diseases.

THE INTERNATIONAL CLASSIFICATION of Diseases (ICD) is revised decennially to improve its usefulness and to bring it up to date. Unfortunately, the revision of code books used for classification of diseases creates problems. Not only do code numbers change, but the categories sometimes include different entities. The resulting break in comparability of cause-of-death statistics presents a problem for those who study trends in mortality. The effects of changes on mortality statistics resulting from earlier revisions of the ICD have been reported previously (1-3). Our concern is with the impact on the 1968 cancer mortality statistics of the introduction of the eighth revision of the ICD in 1965 (4) that was adapted for use in the United States (5). When it was observed that U.S. lung cancer deaths had increased nearly twice as much from 1967 to 1968 as they had increased in the previous 4 or 5 years-from 5 to approximately 10 percent-a research project was devised to study all sites of cancer, as well as of the lung.